Definition of hapax legomenon noun from the Oxford Advanced Learner's Dictionary

 

hapax legomenon

 noun
noun
BrE BrE//ˌhæpæks lɪˈɡɒmɪnɒn//
 
; NAmE NAmE//ˌhæpæks ləˈɡɑːmənɑːn//
 
(pl. hapax legomena
BrE BrE//ˌhæpæks lɪˈɡɒmɪnə//
 
; NAmE NAmE//ˌhæpæks ləˈɡɑːmənə//
 
)
(linguistics)
 
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a word or phrase which is recorded as having been used only once Word Origin mid 17th cent.: Greek, ‘a thing said once’, from hapax ‘once’ and the passive participle of legein ‘to say’.