Word part · Latin root
Act root words: meaning and 25 examples
In short
The Latin root act (from Latin) means "do, or drive". Words with it include react, reacts, reacted, reacting, reaction and reactions. Act is a word by itself, so students can check the meaning in every longer word: a reactor is where something acts back.
- Part
- act
- Meaning
- do, or drive
- Origin
- Latin
- Words listed
- 25
Act is a word by itself, so students can check the meaning in every longer word: a reactor is where something acts back.
Words with the Latin root act
The list runs from shorter, common words to longer ones. The bands are a rough guide built from syllable count and how common each word is in our word list, not a grade-level standard. Read each word, then its word sum.
Colors:prefixroot or basesuffix
Start here: short, common words (about grades 3 and 4)
| Word | Word sum | What it means |
|---|---|---|
| react | re (prefix)+act (root or base)→react | act back when something happens to you |
| reacts | re (prefix)+act (root or base)+s (suffix)→reacts | acts back to something (one person, now) |
| exact | ex (prefix)+act (root or base)→exact | just right, with nothing extra or missing |
| acted | act (root or base)+ed (suffix)→acted | did something, or played a part, in the past |
| acting | act (root or base)+ing (suffix)→acting | doing something, or playing a part, now |
| actors | act (root or base)+or (suffix)+s (suffix)→actors | people who play parts in a show |
| action | act (root or base)+ion (suffix)→action | the act of doing something |
| actor | act (root or base)+or (suffix)→actor | a person who acts in plays or films |
| active | act (root or base)+ive (suffix)→active | tending to act; busy and moving |
More words: act, acts
Next: longer words (about grades 5 and 6)
| Word | Word sum | What it means |
|---|---|---|
| reacted | re (prefix)+act (root or base)+ed (suffix)→reacted | acted back to something in the past |
| reacting | re (prefix)+act (root or base)+ing (suffix)→reacting | acting back to something, now |
| reaction | re (prefix)+act (root or base)+ion (suffix)→reaction | what you do or feel when something happens |
| reactions | re (prefix)+act (root or base)+ion (suffix)+s (suffix)→reactions | more than one reaction |
| reactor | re (prefix)+act (root or base)+or (suffix)→reactor | a machine where a strong reaction is made and controlled |
| exactly | ex (prefix)+act (root or base)+ly (suffix)→exactly | in a way that is just right |
| actively | act (root or base)+ive (suffix)+ly (suffix)→actively | in a busy, doing way |
| activity | act (root or base)+ive (suffix)+ity (suffix)→activitydrop the e | something you do; being active |
| transaction | trans (prefix)+act (root or base)+ion (suffix)→transaction | an act of trading, such as buying or selling |
More words: activate, actually
Stretch: long or less common words (about grades 7 and 8)
| Word | Word sum | What it means |
|---|---|---|
| reactive | re (prefix)+act (root or base)+ive (suffix)→reactive | quick to act back |
| interactive | inter (prefix)+act (root or base)+ive (suffix)→interactive | letting people and things act back and forth |
| interaction | inter (prefix)+act (root or base)+ion (suffix)→interaction | the act of acting with each other |
Where does act sit in a word?
A root can come first, last or in the middle. Students who only look at the start of a word miss half of these.
- At the start:
- actively, acted, acting, actors
- In the middle:
- reaction, reactions, reactor, reactive, exactly, interactive
- At the end:
- react, reacts, reacted, reacting, exact
How do you teach the root act?
Act is the friendliest root to start with because it is already a word students say. Write act, then action, actor and active underneath, and ask what each one has to do with doing something. Then add re for react: to act back. Exact is the surprise. It comes from ex plus act, and first meant driven out, then measured out precisely. Students like knowing that a word they use every day hides two parts.
A quick routine
Start with the rule of the day: act means do. Say, "I'll build words, and you tell me who is doing what," then write react. Ask what happens first and who acts back. Next, write reactor, interactive and actively one at a time. The student reads each, underlines act, and says the meaning in a sentence that starts "It's when..." so the idea of doing stays in front. End by dictating reaction and checking that act sits in the middle untouched.
What do students mix up with act?
Act hides inside words where it isn't the root at all. Fact and factory come from a different root, fac, which means make. Character and practice have the letters a, c, t but no doing in them. Teach the check: cover the rest of the word and ask whether doing or acting fits the meaning.
Some of these words change spelling where the parts join. The spelling rules pages cover dropping e, doubling and changing y to i. For the sounds inside these words, see the phonics word lists. Routines that fit: meanings of prefixes and suffixes, circle the parts, read the base and flexible routine for big words.
Questions people ask
What does the root act mean?
Act means "do, or drive". It is a Latin root. Act is a word by itself, so students can check the meaning in every longer word: a reactor is where something acts back.
What are some words with the root act?
Start with react, reacts, exact and acted. Then move to reacted, reacting, reactive and interactive. This page lists 25 words in all, most with a word sum that shows the parts.
Is fact from the root act?
No. Fact comes from fac, a Latin root meaning make or do. The letters overlap, but the roots are different. Fact first meant a thing done.
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