'pressure' originates from Latin, specifically the word 'pressura,' where 'press-' meant 'to press.' 'Associate' originates from Latin, specifically the word 'associatus,' where 'ad-' meant 'to' and 'sociatus' meant 'joined.'

'Pressure' changed from the Old French word 'pressur' and eventually became the modern English word 'pressure.' 'Associate' transformed from the Old French word 'associer' and eventually became the modern English word 'associate.'

Initially, 'pressure' meant 'the act of pressing,' but over time it evolved into its current meaning of 'force exerted on an object.' 'Associate' initially meant 'to join or connect,' and this meaning has largely remained the same in modern usage.