English:Prefixes, Suffixes, and Roots
Prefixes, Suffixes, and Roots
Introduction
Words are often made from smaller meaningful parts. When you learn these parts, you can unlock unfamiliar vocabulary, improve your spelling, and notice connections between words.
A prefix comes before a base or root. A suffix comes after it. A root carries the central meaning of a word. Prefixes and suffixes are both kinds of affixes.[1]
For example, the word unhelpful can be divided into three parts:
| Prefix | Root or base | Suffix | Whole-word meaning |
|---|---|---|---|
| un- | help | -ful | not helpful |
You do not need to memorize every word part at once. The goal is to learn common patterns and use them together with context.
The diagram places morphology, the study of word structure, among the major levels of language. In this course, you will focus on how meaningful parts combine to make words.
Learning Goals
By the end of this aiMOOC, you should be able to:
- Identify prefixes and explain how they change meaning.
- Identify suffixes and explain how they change meaning or word class.
- Recognize common roots from English, Greek, and Latin.
- Use context clues together with word parts.
- Build and analyze words accurately.
- Check a dictionary when a word does not follow an expected pattern.
The Building Blocks of Words
Morphemes
A morpheme is the smallest part of a word that carries meaning or a grammatical job.[2]
Some morphemes can stand alone:
| Free morpheme | Meaning | Example |
|---|---|---|
| help | give support | helpful |
| play | take part in a game or activity | replay |
| kind | caring | kindness |
Other morphemes cannot usually stand alone:
| Bound morpheme | Meaning | Example |
|---|---|---|
| un- | not or reverse | unfair |
| -less | without | careless |
| struct | build | construct |
A word may contain one morpheme, as in book, or several, as in reusable: re- + use + -able.
Root, Base, and Affix
These three terms are related but not identical.
| Term | Clear meaning | Example |
|---|---|---|
| Root | The central meaning-bearing part | help in unhelpful |
| Base | The form to which an affix is added | helpful is the base for un- in unhelpful |
| Affix | A meaningful part attached to a base | un- and -ful |
A root may be a complete word, such as help. It may also be a bound root that normally appears with other parts, such as struct in construct, structure, and instruct.
Try it: Break misunderstanding into meaningful parts. Then explain the job of each part.
Prefixes
A prefix is an affix placed before a base.[3] A prefix usually changes a word's meaning. In English, a prefix usually does not change the word class.
Examples:
- happy is an adjective, and unhappy is still an adjective.
- write is a verb, and rewrite is still a verb.
- agreement is a noun, and disagreement is still a noun.
This word cloud shows many common English prefixes. Larger size does not mean that a prefix is always more important, so focus on meaning and examples.
Common Prefixes
| Prefix | Common meaning | Example | Meaning of the example |
|---|---|---|---|
| un- | not or reverse | unhappy | not happy |
| re- | again or back | rebuild | build again |
| dis- | not, opposite, or apart | disagree | not agree |
| pre- | before | preview | view before |
| mis- | wrongly or badly | misread | read wrongly |
| non- | not | nonfiction | writing that is not fiction |
| over- | too much or above | overcook | cook too much |
| under- | too little or below | underpaid | paid too little |
| sub- | under or below | submarine | vessel that travels under water |
| inter- | between or among | interact | act with one another |
| anti- | against | antifreeze | substance that works against freezing |
| bi- | two | bilingual | using two languages |
A prefix can have more than one meaning. For example, un- means not in unfair, but it means reverse an action in unlock. Context tells you which meaning fits.
Prefixes and Hyphens
Many prefixed words are written as one word, such as redo and unfair. Some use a hyphen to make the meaning clearer, especially before a capital letter or when two vowels might be confusing, such as pre-Roman or re-enter. Spelling patterns vary, so check a current dictionary when you are unsure.
Suffixes
A suffix is an affix placed after a base.[4] A suffix may change meaning, grammar, or word class.
Examples:
- kind is an adjective, but kindness is a noun.
- teach is a verb, but teacher is a noun.
- quick is an adjective, but quickly is an adverb.
- walk is a verb, and walked shows past time.
Common Suffixes
| Suffix | Common meaning or job | Example | Meaning or word class |
|---|---|---|---|
| -ful | full of | hopeful | full of hope |
| -less | without | fearless | without fear |
| -ness | state or quality | darkness | state of being dark |
| -ment | action, process, or result | movement | act or process of moving |
| -er | person or thing that acts | reader | person who reads |
| -able | able to be | washable | able to be washed |
| -ly | in a certain way | calmly | in a calm way |
| -tion | act, process, or result | invention | result of inventing |
| -ist | person who practices or studies | artist | person who creates art |
| -ous | full of or having | dangerous | having danger |
| -en | make or become | strengthen | make strong |
| -ship | state, skill, or relationship | friendship | relationship between friends |
Some suffixes have more than one job. The suffix -er names a person in runner, but it compares two things in faster.
Derivational and Inflectional Suffixes
A derivational suffix forms a new word or changes the word class:
| Base | Suffix | New word | Change |
|---|---|---|---|
| happy | -ness | happiness | adjective to noun |
| care | -ful | careful | noun or verb to adjective |
| quick | -ly | quickly | adjective to adverb |
An inflectional suffix changes the grammatical form without creating a completely new dictionary word:
| Base | Suffix | New form | Grammatical job |
|---|---|---|---|
| cat | -s | cats | plural |
| jump | -ed | jumped | past tense |
| tall | -er | taller | comparative |
Roots and Word Families
A root carries the central idea shared by related words. Learning one root can help you understand a whole word family.
For example:
| Root | Related words | Shared idea |
|---|---|---|
| act | action, active, actor, react | doing |
| move | movement, movable, remove | motion |
| sign | signal, signature, design, resign | mark or indication |
A word matrix shows how prefixes, a root, and suffixes can combine. Read it by choosing a path through the matrix from left to right.
Common Greek and Latin Roots
Many English academic and scientific words contain roots from Greek or Latin.
| Root | Meaning | Example | Meaning clue |
|---|---|---|---|
| bio | life | biology | study of life |
| geo | earth | geography | study or description of Earth |
| graph | write or record | autograph | a person's own written signature |
| tele | far | telescope | instrument for viewing far objects |
| phon | sound | microphone | device that changes sound into a signal |
| port | carry | transport | carry from one place to another |
| dict | say or speak | predict | say what may happen before it happens |
| scrib | write | describe | write or tell about |
| script | write | manuscript | text written by hand or prepared for reading |
| struct | build | construction | process of building |
| vis | see | visible | able to be seen |
| vid | see | video | recorded moving images |
| aud | hear | audience | group that hears or watches |
| tract | pull or draw | attract | draw toward |
A root clue is useful, but it may not give the whole meaning. For example, telephone contains tele meaning far and phon meaning sound. The full word names a device or system for communicating sound over distance.
Word Families Grow in More Than One Step
Word building can happen in stages:
| Stage | Word | What changed |
|---|---|---|
| Root or base | act | central meaning |
| Add a suffix | active | forms an adjective |
| Add a prefix | inactive | changes the meaning to not active |
| Add another suffix | inactivity | forms a noun |
To analyze a long word, work from the outside and test each layer.
Spelling Changes When Suffixes Are Added
Sometimes a base changes spelling before a suffix.
Change Final y to i
When a word ends in a consonant plus y, the y often changes to i before a suffix:
| Base | Suffix | New word |
|---|---|---|
| happy | -ness | happiness |
| easy | -ly | easily |
A common exception is before -ing: carry becomes carrying.
Drop a Silent e
A final silent e is often dropped before a suffix that begins with a vowel:
| Base | Suffix | New word |
|---|---|---|
| use | -able | usable |
| create | -ive | creative |
The final e may stay when it protects pronunciation or clarity, as in noticeable.
Double the Final Consonant
A short word may double its final consonant before a vowel-starting suffix:
| Base | Suffix | New word |
|---|---|---|
| run | -er | runner |
| begin | -ing | beginning |
These rules have exceptions. Use the pattern as a clue, then check a dictionary.
How to Unlock an Unfamiliar Word
Use this five-step strategy:
- Read the whole sentence. Look for context clues.
- Spot familiar parts. Mark a possible prefix, root, and suffix.
- State each meaning. Keep the meanings short.
- Combine the clues. Make a sensible whole-word meaning.
- Check your idea. Reread the sentence and use a dictionary if needed.
Worked Example: Unpredictable
Sentence: The sudden storm made the afternoon weather unpredictable.
| Part | Meaning |
|---|---|
| un- | not |
| predict | say what may happen before it happens |
| -able | able to be |
Combined clue: not able to be predicted. This meaning fits the sentence because the storm was sudden.
Worked Example: Transportation
Sentence: The city improved transportation by adding more buses.
| Part | Meaning |
|---|---|
| trans- | across |
| port | carry |
| -ation | process or result |
Combined clue: the process or system of carrying across or from place to place. In the sentence, it refers to ways of moving people.
Worked Example: Carelessness
Sentence: Carelessness with the paint caused a large spill.
| Part | Meaning |
|---|---|
| care | attention or concern |
| -less | without |
| -ness | state or quality |
Combined clue: the state of being without enough care. This meaning explains why the spill happened.
Important Cautions
Word-part analysis is powerful, but it is not a guessing machine.
- A group of letters may look like a prefix without being one. Uncle is not un- + cle.
- A word ending may look like a suffix without having that job. The -er in corner does not mean a person who corns.
- One affix may have several meanings. Un- means not in unfair and reverse in untie.
- A root may change spelling. Scrib and script both carry the idea of writing.
- The history of a word may be complex. Modern meaning does not always equal the simple sum of its oldest parts.
- Context must agree with your word-part meaning.
- A dictionary is the final check when the pattern is uncertain.
Interactive Tasks
Quiz: Test Your Knowledge
Where is a prefix placed? (Before a base) (!After a base) (!Inside every syllable) (!Only at the end of a sentence)
Which part carries the central meaning of a word? (The root) (!The punctuation) (!The article) (!The capital letter)
What does re- usually mean in rewrite? (Again) (!Without) (!Under) (!Two)
Which word means without fear? (Fearless) (!Fearful) (!Feared) (!Fearing)
Which suffix changes kind into a noun naming a quality? (-ness) (!-ly) (!-ed) (!-ing)
What does the root bio mean? (Life) (!Sound) (!Earth) (!Writing)
Which word contains a prefix meaning wrongly? (Misread) (!Reader) (!Reading) (!Readable)
What is the best first step when meeting an unfamiliar word in a sentence? (Read the whole sentence) (!Ignore the sentence) (!Remove every vowel) (!Guess from word length)
Which word shows a spelling change from happy plus -ness? (Happiness) (!Happyness) (!Happyment) (!Unhappyly)
Why should you check context after analyzing word parts? (To see whether the meaning fits) (!To count all letters) (!To remove the root) (!To change every suffix)
Memory Game
| Prefix | An affix placed before a base |
| Suffix | An affix placed after a base |
| Root | The central meaning-bearing part |
| Morpheme | The smallest meaningful language unit |
| Derivation | Word formation that creates a new word |
| Inflection | A grammatical change to a word form |
Drag and Drop
| Match the correct terms. | Topic |
|---|---|
| Means again | re- |
| Means without | -less |
| Means life | bio |
| Means before | pre- |
| Means able to be | -able |
Match each meaning to the correct word part. Then use every word part in a new example.
Crossword Puzzle
| Prefix | What word part is placed before a base? |
| Suffix | What word part is placed after a base? |
| Morpheme | What is the smallest meaningful unit in a word? |
| Rootword | What central word part may sometimes stand alone? |
| Derivation | What process creates a new word by adding meaningful parts? |
| Inflection | What process changes grammatical form without making a completely new word? |
LearningApps
Cloze Text
Open-Ended Tasks
Easy
- Prefix Hunt: Find ten prefixed words in a book, website, or classroom poster; underline each prefix and explain its meaning.
- Suffix Sort: Create cards for twelve suffixed words and sort them by the jobs of their suffixes.
- Word-Part Comic: Draw a four-panel comic in which a prefix changes the meaning of a base word.
- Family Tree of Words: Make a word-family tree for help, act, play, or move and label every prefix and suffix.
Standard
- Vocabulary Interview: Interview a classmate or adult about an unfamiliar school word and show how its parts and context reveal meaning.
- Word Matrix Project: Build a word matrix around one root and use it to form at least eight real words.
- Instruction Video: Record a two-minute video teaching one prefix, one suffix, and one root with examples.
- Dictionary Investigation: Compare your predicted meanings of eight complex words with dictionary definitions and explain any differences.
Advanced
- Science Root Guide: Create an illustrated guide to ten Greek or Latin roots used in science and explain how each root supports comprehension.
- Spelling Experiment: Test suffix spelling rules with at least twenty words, group the results, and write conclusions about patterns and exceptions.
- Language Landscape Survey: Photograph or transcribe complex words from signs, labels, or public information and analyze their word parts without recording private information.
- Etymology Mini-Documentary: Produce a short documentary tracing one word family through its roots, changes in meaning, and modern uses.
Learning Assessment
- Meaning in Context: Analyze three unfamiliar words in a short passage, explain each word part, and justify the final meanings using sentence evidence.
- Compare Two Words: Compare two words that share a root but use different affixes, and explain how the affixes change meaning or word class.
- Correct the Analysis: Review an incorrect word breakdown, identify the mistake, and provide a better analysis with reasoning.
- Build for a Purpose: Create a word with a given root and affixes, use it in a clear sentence, and explain why the word fits.
- Transfer to Science: Use roots and affixes to interpret five terms from a science or geography text, then verify them with a glossary.
- Evaluate a Strategy: Explain when word-part analysis is useful, when it may fail, and what another reader should do next.
Evidence of Learning
- Knowledge: You can define prefix, suffix, root, base, affix, morpheme, derivation, and inflection.
- Skills: You can divide complex words into meaningful parts, combine meaning clues, and test an interpretation in context.
- Products: You can create word matrices, annotated word-family trees, explanations, posters, recordings, or short videos.
- Accuracy: You can recognize false breaks, spelling changes, multiple meanings, and important exceptions.
- Transfer: You can apply word-part knowledge to vocabulary in literature, science, social studies, mathematics, and daily life.
- Reflection: You can explain which strategy helped you most and how you checked your reasoning.
OERs on the Topic
Sources and Further Reading
The definitions and examples in this course are based on standard descriptions of morphology, affixes, prefixes, suffixes, and roots. The media files are freely licensed on Wikimedia Commons, and the videos are freely accessible educational resources.
Linked Learning Areas
The topic connects language study with reading, writing, spelling, dictionary skills, science vocabulary, social studies vocabulary, and the study of word origins.