'approve' originates from Latin, specifically the word 'approbare,' where 'ad-' meant 'to' and 'probare' meant 'to test or prove.'

'approbare' transformed into the Old French word 'aprover,' and eventually became the modern English word 'approve' through Middle English.

Initially, it meant 'to test or prove something,' but over time it evolved into its current meaning of 'to accept or agree with something.'