'improve' originates from Latin, specifically the word 'improbare,' where 'in-' meant 'not' and 'probare' meant 'to test or prove.'

'improbare' transformed into the Old French word 'emprover,' and eventually became the modern English word 'improve' through Middle English.

Initially, it meant 'to make better or more valuable,' and this meaning has largely remained the same in modern usage.