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say it: YEH-stur-day
yesterday is a noun and adverb meaning "the day immediately before today". It carries 4 recorded senses.
on the day preceding today
“yesterday the weather was beautiful”
in the recent past; only a short time ago
“I was not born yesterday!”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for yesterday come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.