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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.

That time span, which felt like an age, became the moment that has the capacity to alter the immediate course of history for Arsenal and West Ham United.

From BBC • May 10, 2026

The heightened attention to the substance comes as wellness intersects more deeply with health, and as GLP-1 weight-loss medications alter the way Americans eat.

From MarketWatch • May 10, 2026

"This is an evolutionarily-adapted response that helps us in many situations. However, prolonged cortisol release is not a good thing. It can lead to a variety of physiological conditions and alter mental health."

From Science Daily • May 3, 2026

The major employee unions could alter the equation if they jump in on Patel’s behalf.

From Los Angeles Times • May 1, 2026

Exorcism cannot alter the countenance of a house; Hill House would stay as it was until it was destroyed.

From "The Haunting of Hill House" by Shirley Jackson

Vocabulary lists containing alter

Jim Burke's Academic Vocabulary List

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Words to Know Before You Defrost the Bird

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

Commonly Confused Words, List 1

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!