Definition

To make something not valid or acceptable; to cancel or nullify it.

Example

The new evidence will invalidate the previous findings.

Tense Forms

Conversation

Did you hear they might invalidate our test scores?

Really? That sounds serious! What happened?

Apparently, there was a mistake in the grading process.

Wow, I hope they don't actually invalidate them; that would be frustrating.

Synonyms & Antonyms

Root Explanation

Invalidate → It is formed from "in-" (meaning not) and "validus" (meaning strong or valid). The word means to make something not valid or to weaken its strength or legitimacy.

Memory Tip

Think of 'not' ('in-') making something 'strong' or 'valid' ('validus') — that's why invalidate means to make something not valid.

Visually Confused Words