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English definition of “all-time”

all-time

adjective [before noun] uk   /ˌɔːlˈtaɪm/ us    /ˌɑːl-/
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.
(Definition of all-time from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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