WordReference Random House Learner's Dictionary of American English © 2026
ˈall-ˌtime,  adj. [before a noun]
  1. never equaled or surpassed: Production will reach an all-time high.
  2. regarded as such in its entire history: an all-time favorite song.

WordReference Random House Unabridged Dictionary of American English © 2026
all-time  (ôl′tīm′),USA pronunciation adj. 
  1. never surpassed or greater:Production will reach an all-time high.
  2. regarded as such in its entire history:an all-time favorite song.
  • 1910–15

Collins Concise English Dictionary © HarperCollins Publishers::
all-time adj
  1. (prenominal) informal unsurpassed in some respect at a particular time

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