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  • noun

Words related to countdown

counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)

References in periodicals archive ?
Later, on April 12, 1981, at T-minus zero - liftoff - I watched as Columbia, attached to the mother ship like a delicate moth, rose slowly and gracefully rotated as she soared into the heavens.
Continue to create your "Classroom Countdown" in this fashion until you get to your final slide (for example, "Math will begin in T-minus 10 seconds).