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English definition of “yesterday”

yesterday

adverb [not gradable]    /ˈjes·tər·deɪ, -di/
on the day before this day: We got back from our vacation yesterday. Yesterday I started exercising seriously. yesterday    /ˈjes·tər·di, -deɪ/ noun [U] "Is that today’s paper?" "No, it’s yesterday’s."
(Definition of yesterday adverb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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