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Definitions

alter

[awl-ter] / ˈɔl tər /
VERB
change
Synonyms
STRONGEST
adjust amend change develop modify reshape revamp revise shift transform vary
STRONG
adapt convert cook diversify doctor metamorphose mutate recast reconstruct refashion reform remodel renovate transmute turn
WEAK
correct mid-course dial back fine tune make different phony up recalibrate
Antonyms
STRONGEST
leave alone remain stagnate stay
WEAK
continue fix keep let stand maintain preserve retain sustain
VERB
sterilize animal
Synonyms
STRONGEST
change fix
STRONG
caponize castrate desexualize emasculate geld mutilate neuter spay unsex
Antonyms
STRONG
breed

Usage

What is another way to say alter? To alter is to make some partial change, as in appearance, while still preserving the identity: to alter a dress, as by raising the hem (to change a dress would mean to put on a different one). To change is to make a material difference so that something is distinctly different from what it was: to change one's opinion. 

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It’s done at the state level, and Congress can legislate to alter the time, place, and manner of elections.

From Slate • Apr. 15, 2026

Could simply changing what people expect to taste alter how much they enjoy sweet drinks?

From Science Daily • Apr. 9, 2026

It can also alter polar and tropical jet streams, sending storms on a path through Southern California and the southern United States, experts say.

From Los Angeles Times • Apr. 9, 2026

Future technologies could even allow companies to alter the course of a storm or reduce its intensity.

From The Wall Street Journal • Apr. 6, 2026

He didn’t alter the way he made investment decisions, for instance, or the way he communicated with his investors.

From "The Big Short" by Michael Lewis

Vocabulary lists containing alter

Jim Burke's Academic Vocabulary List

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Words to Know Before You Defrost the Bird

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Commonly Confused Words, List 1

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