'frequently' originates from Latin, specifically the word 'frequentia,' where 'frequent-' meant 'crowded or repeated.' 'Available' originates from Old French, specifically the word 'avaler,' where 'a-' meant 'to' and 'valoir' meant 'to be worth.'

'frequentia' transformed into the Old French word 'frequent,' and eventually became the modern English word 'frequent.' 'Avaler' transformed into the Middle English word 'availe,' and eventually became the modern English word 'available.'

Initially, 'frequent' meant 'crowded or repeated,' and 'available' meant 'to be worth,' but over time they evolved into their current meanings of 'often occurring' and 'accessible or obtainable.'