'perpetually' originates from Latin, specifically the word 'perpetuus,' where 'per-' meant 'through' and 'petere' meant 'to seek.' 'Available' comes from the Old French 'avaler,' meaning 'to descend or go down.'

'Perpetually' changed from the Latin word 'perpetuus' and eventually became the modern English word 'perpetual.' 'Available' evolved from the Old French 'avaler' to the modern English 'available.'

Initially, 'perpetual' meant 'lasting forever,' but over time it evolved into its current meaning of 'continuous or constant.' 'Available' originally meant 'to descend,' but now means 'accessible or obtainable.'