one-time

The compound adjective 'one-time' is a transparent combination of two native English elements. The first element, 'one', derives from the Old English numeral 'ān', which has maintained its core meaning of singularity from its Proto-Indo-European root. The second element, 'time', originates from Old English 'tīma', referring to a measured or appointed period. When combined, the literal meaning "a single occasion" logically gives rise to the modern definitions. The sense of "former" (e.g., a one-time champion) is a semantic extension, implying something that occurred in a single, now-past period, distinguishing it from the present.

Structure: one (single) + time (occasion) - one: From Old English 'ān', meaning "one, a single". Its ultimate origin is Proto-Indo-European óynos, meaning "one, single". - time: From Old English 'tīma', meaning "a period, season, era". Its ultimate origin is Proto-Indo-European dī-mon-, related to the concept of division or a portion of duration.