Thesaurus.com
Dictionary.com
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.

Would this new job significantly alter your lifestyle?

From MarketWatch • Apr. 24, 2026

Over time, diets high in fat and sugar can alter the lining of the duodenum, changing how the body processes food and regulates hormones.

From Science Daily • Apr. 23, 2026

For them, the verdict marks only another step in a case that has stretched on for years - one that does not alter what was lost on that summer day in 2018.

From BBC • Apr. 23, 2026

The voluntary retirement program is part of a broader shift to alter Microsoft’s performance system and stock awards.

From The Wall Street Journal • Apr. 23, 2026

In accordance with his arrangements there was no music, no fireworks, no pealing bells, no shouts of victory, or any other manifestation that might alter the mournful character of the armistice.

From "One Hundred Years of Solitude" by Gabriel Garcia Marquez

Vocabulary lists containing alter

Jim Burke's Academic Vocabulary List

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

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!