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[ok-tuh-juh-nair-ee-uh n] /ˌɒk tə dʒəˈnɛər i ən/

adjective, Also, octogenary
[ok-toj-uh-ner-ee] /ɒkˈtɒdʒ əˌnɛr i/ (Show IPA)
of the age of 80 years.
between 80 and 90 years old.
a person who is between 80 and 90 years old.
noun (pl) -narians, -naries
a person who is from 80 to 89 years old
of or relating to an octogenarian

1789, with -an + French octogénaire “aged 80,” from Latin octogenarius “containing eighty,” from octogeni “eighty each,” related to octoginta “eighty,” from octo “eight” (see eight) + -genaria “ten times,” from PIE *dkm-ta-, from *dekm- “ten” (see ten). As an adjective from 1784.

octogenarian oc·to·ge·nar·i·an (ŏk’tə-jə-nâr’ē-ən)
Being between 80 and 90 years of age. n.
A person between 80 and 90 years of age.


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