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

 

signal

 adjective
adjective
BrE BrE//ˈsɪɡnəl//
 
; NAmE NAmE//ˈsɪɡnəl//
 
 
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[only before noun] (formal) important and noticeable a signal honour a signal failure of leadership Word Originadjective early 17th cent.: from French signalé, from the Italian past participle segnalato ‘distinguished, made illustrious’, from segnale ‘a signal’.
See the Oxford Advanced American Dictionary entry: signal