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

 

Jaycee

 noun
noun
BrE BrE//ˈdʒeɪsiː//
 
; NAmE NAmE//ˈdʒeɪsiː//
 
(North American English, informal)
 
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a member of the United States Junior Chamber, an organization for people between the ages of 21 and 39 that provides help in local communities in the US and other countries Word Origin 1940s: representing the initials of Junior Chamber.
See the Oxford Advanced American Dictionary entry: Jaycee