English

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

 

yesterday

 adjective
adjective
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 Origin Old English giestran dæg (from yester- Old English geostran, of Germanic origin + day).
See the Oxford Advanced American Dictionary entry: yesterday