play: [OE] The origins of play are obscure. It had a relative in Middle Dutch pleien ‘dance about, jump for joy’, but this has now died out, leaving it in splendid but puzzling isolation, its ancestry unaccounted for. Its underlying meaning appears to be ‘make rapid movements for purposes of recreation’, but already in Old English times it was being used for ‘perform on a musical instrument’. The earliest record of the use of the noun for a ‘dramatic work’ is from the 14th century. [play etymology, play origin, 英语词源]