Definition of sui generis adjective from the Oxford Advanced Learner's Dictionary

 

sui generis

 adjective
adjective
BrE BrE//ˌsuːi ˈdʒenərɪs//
 
; NAmE NAmE//ˌsuːi ˈdʒenərɪs//
 
; BrE BrE//ˌsuːi ˈɡenərɪs//
 
; NAmE NAmE//ˌsuːi ˈɡenərɪs//
 
; BrE BrE//ˌsuːaɪ ˈdʒenərɪs//
 
; NAmE NAmE//ˌsuːaɪ ˈdʒenərɪs//
 
; BrE BrE//ˌsuːaɪ ˈɡenərɪs//
 
; NAmE NAmE//ˌsuːaɪ ˈɡenərɪs//
 
(from Latin, formal)
 
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different from all other people or things synonym unique Word OriginLatin, literally ‘of its own kind’.
See the Oxford Advanced American Dictionary entry: sui generis