Definition of yay adverb from the Oxford Advanced American Dictionary

     

    yay

     adverb
    adverb
    NAmE//yeɪ//
     
    (informal)
     
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  1. 1to this degree synonym so The fish I caught was yay big.
  2. 2to a high degree synonym extremely Yay good movie!
See the Oxford Advanced Learner's Dictionary entry: yay

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