invalidate

If administrators find out that students cheated on a test, the school might invalidate their class grades. To invalidate means to cancel something or make it void, as if it never happened.

In invalidate you see the word valid which means true or correct. When you invalidate something you are making it less true, less official, or less correct. If you buy something that doesn't work properly and then try to fix it yourself, you invalidate the warranty. If you have a wacky theory that cars grow from trees, your teacher might invalidate your theory by taking you on a tour of an auto factory.

Definitions of invalidate
1

v make invalid for use

Synonyms:
cancel
Type of:
mark, score
make underscoring marks

v declare invalid

Synonyms:
annul, avoid, nullify, quash, void
Antonyms:
formalise, formalize, validate
declare or make legally valid
Types:
break
invalidate by judicial action
stet
printing: cancel, as of a correction or deletion
Type of:
cancel, strike down
declare null and void; make ineffective

v take away the legal force of or render ineffective

invalidate a contract”
Synonyms:
vitiate, void
Antonyms:
validate
make valid or confirm the validity of
Type of:
alter, change, modify
cause to change; make different; cause a transformation

v show to be invalid

Synonyms:
nullify
Antonyms:
validate
prove valid; show or confirm the validity of something
Type of:
contradict, negate
prove negative; show to be false

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