Definition of yes noun from the Oxford Advanced Learner's Dictionary

  

yes

 noun
noun
BrE BrE//jes//
 
; NAmE NAmE//jes//
 
 
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 (pl. yesses, yeses
BrE BrE//ˈjesɪz//
 
; NAmE NAmE//ˈjesɪz//
 
)
an answer that shows that you agree with an idea, a statement, etc.; a person who says ‘yes’ I need a simple yes or no to my questions. There will be two ballot boxes—one for yesses and one for noes. I'll put you down as a yes. When the villagers were asked if they wanted the factory to be built, the answer was a resounding yes.
Word Origin Old English gēse, gīse, probably from an unrecorded phrase meaning ‘may it be so’.
See the Oxford Advanced American Dictionary entry: yes