To make something legally or logically void; to prove that an argument, theory, or claim is wrong or without foundation. It means to remove the validity or force of something.
From Latin 'invalidus' meaning 'not strong,' formed from 'in-' (not) and 'validus' (strong, effective). The word evolved to mean making something legally or logically powerless.
Invalidate is like pulling the foundation out from under a building—once something is invalidated, everything built on top of it comes tumbling down! That's why invalidating one key assumption can destroy an entire argument.
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