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English definition of “yesterday”

yesterday

adverb uk   /ˈjes.tə.deɪ/ us    /-tɚ-/
A1 on the day before today: He called yesterday while you were out. I saw her yesterday afternoon.

yesterday

noun uk   /ˈjes.tə.deɪ/ us    /-tɚ-/
[U] the day before today: "Is that today's paper?" "No, it's yesterday's." the day before yesterday two days ago: I called her the day before yesterday. [C or U] the recent past: Nobody's interested in yesterday's pop stars. These songs are a part of all our yesterdays.
(Definition of yesterday from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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