Definition of yesterday adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈjestədeɪ//
; NAmE NAmE//ˈjestərd//
; BrE BrE//ˈjestədi//
; NAmE NAmE//ˈjestərdi//
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[not before noun] (informal, often humorous) no longer fashionable or new Email—that's so yesterday! PCs are so yesterday. Word OriginOld English giestran dæg (from yester- Old English geostran, of Germanic origin + day).
See the Oxford Advanced American Dictionary entry: yesterday