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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.

The nation’s second-largest school system, with about 390,000 students, faces evolving challenges and uncertainties that could alter the direction of the district for years.

From Los Angeles Times • Apr. 30, 2026

The only tournaments where he can significantly alter and improve his already stellar career are done and dusted three months from now.

From BBC • Apr. 29, 2026

The Gulf country said in a statement that it would exit the cartel effective May 1, adding that the decision wouldn’t alter its “commitment to global market stability,” state-run news agency WAM reported.

From Barron's • Apr. 28, 2026

The study also noted that harvesting can require sacrificing the agave before it reaches sexual maturity, which can alter future population dynamics.

From Science Daily • Apr. 26, 2026

And wonderfully, after that, the young women were finally allowed to find ways to alter their boots to make them fit better.

From "A Thousand Sisters" by Elizabeth Wein

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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