Definition of octogenarian

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< octodecimo

octonary >

oc·to·ge·nar·i·an    (kt-j-nâr-n) KEY 

ADJECTIVE:

Being between 80 and 90 years of age.

NOUN:

A person between 80 and 90 years of age.

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ETYMOLOGY:
From French octogénaire, from Latin octgnrius, containing eighty, from octgn, eighty each, from octgint, eighty : oct, eight; see okt(u) in Indo-European roots + -gint, ten times; see dek in Indo-European roots