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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.

Paul Alexander Nolan’s Max, the owner of a boardwalk video store who crashes into the lives of the Emerson family, puts on a Clark Kent facade to conceal his nefarious alter ego.

From Los Angeles Times • May 1, 2026

Congress cut taxes in 2013, 2017 and 2025, expanded government health coverage and veterans benefits, and did little to alter major spending programs.

From The Wall Street Journal • Apr. 30, 2026

For now, the findings do not significantly alter the overall risk in the Cascadia region.

From Science Daily • Apr. 29, 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

Hazel did not mean to alter his ways or take instructions from Cowslip.

From "Watership Down: A Novel" by Richard Adams

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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