'invalidate' originates from Latin, specifically the word 'invalidare,' where 'in-' meant 'not' and 'validus' meant 'strong or valid.'

'invalidare' transformed into the French word 'invalider,' and eventually became the modern English word 'invalidate' through Middle English.

Initially, it meant 'to make something not valid or strong,' and this meaning has largely remained the same in modern usage.