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

 

dummy

 adjective
adjective
BrE BrE//ˈdʌmi//
 
; NAmE NAmE//ˈdʌmi//
 
 
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[only before noun] made to look real, although it is actually a copy which does not work synonym replica a dummy bomb Word Origin late 16th cent.: from dumb + -y. The original sense was ‘a person who cannot speak’, then ‘an imaginary fourth player in whist’ (mid 18th cent.), whence ‘a substitute for the real thing’ and ‘a model of a human being’ (mid 19th cent.).
See the Oxford Advanced American Dictionary entry: dummy