countdown /ˈkaʊntˌdaʊn/noun 3verb 1forms 3 noun3 •A count backward in fixed units to the time of some event, especially the launch of a space vehicle. •A radio or television program counting down the top songs of a given week, usually in reverse order and ending with the number one song. •The acts of preparation carried out during this period. verb1 •(nonstandard) To count down.Time measures itself out in a series of diminishing peristaltic ticks, countdowning slowly towards the miracle of Ignition. — 2000 formscountdowned · countdowning · countdowns