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

 

octogenarian

 noun
noun
BrE BrE//ˌɒktədʒəˈneəriən//
 
; NAmE NAmE//ˌɑːktədʒəˈneriən//
 
 
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a person between 80 and 89 years old Word Origin early 19th cent.: from Latin octogenarius (based on octoginta ‘eighty’) + -an.
See the Oxford Advanced American Dictionary entry: octogenarian