Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: Latin
Origin: octogenarius 'containing eighty', from octoginta 'eighty'

octogenarian

 noun
     
oc‧to‧ge‧nar‧i‧an [countable]
someone who is between 80 and 89 years old
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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