Meaning of “yesterday” in the English Dictionary

"yesterday" in British English

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yesterdayadverb

uk /ˈjes.tə.deɪ/ us /ˈjes.tɚ.deɪ/

A1 on the day before today:

He called yesterday while you were out.
I saw her yesterday afternoon.

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yesterdaynoun

uk /ˈjes.tə.deɪ/ us /ˈjes.tɚ.deɪ/

[ 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"yesterday" in American English

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yesterdayadverb [ not gradable ]

us /ˈjes·tər·deɪ, -di/

on the day before this day:

We got back from our vacation yesterday.
Yesterday I started exercising seriously.
yesterday
noun [ U ] us /ˈjes·tər·di, -deɪ/

"Is that today’s paper?" "No, it’s yesterday’s."

(Definition of “yesterday” from the Cambridge Academic Content Dictionary © Cambridge University Press)