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all-time

adjective [before noun]
 
 
/ˌɔːlˈtaɪm/ US  /ˌɑːl-/

Definition

An all-time high, low, best, etc. is the highest, lowest, best, etc. level that has ever been: After three years of drought, the water in the lake had reached an all-time low.Always and never
(Definition of all-time adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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