'initially-used' originates from the combination of 'initially,' meaning 'at the beginning,' and 'used,' meaning 'employed for a purpose.'

'initially' comes from the Latin word 'initialis,' meaning 'pertaining to a beginning,' and 'used' comes from the Old French 'user,' meaning 'to employ.'

Initially, it meant 'used at the start,' and this meaning has largely remained the same in modern usage.