'periodically-delivered' originates from the combination of 'periodically' and 'delivered'. 'Periodically' comes from 'periodic', which originates from the Greek word 'periodikos', meaning 'recurring at intervals'. 'Delivered' comes from the Latin word 'deliberare', meaning 'to set free'.

'Periodically-delivered' combines the concept of regular intervals from 'periodically' with the action of 'delivered', forming a modern English adjective.

Initially, 'periodically' meant 'recurring at intervals', and 'delivered' meant 'to set free'. Together, they evolved to mean 'delivered at regular intervals'.