octogenary

octogenarian

[ok-tuh-juh-nair-ee-uhn]
adjective Also, octogenary [ok-toj-uh-ner-ee] .
1.
of the age of 80 years.
2.
between 80 and 90 years old.
noun
3.
a person who is between 80 and 90 years old.

Origin:
1805–15; < Latin octōgēnāri(us) comprising eighty, eighty years old (equivalent to octōgēn(ī) eighty each + -ārius -ary) + -an

octogenarianism, noun
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World English Dictionary
octogenarian or (less commonly) octogenary (ˌɒktəʊdʒɪˈnɛərɪən, ɒkˈtɒdʒɪnərɪ)
 
n , pl -narians, -naries
1.  a person who is from 80 to 89 years old
 
adj
2.  of or relating to an octogenarian
 
[C19: from Latin octōgēnārius containing eighty, from octōgēnī eighty each]
 
octogenary or (less commonly) octogenary
 
n
 
adj
 
[C19: from Latin octōgēnārius containing eighty, from octōgēnī eighty each]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

octogenarian
1815, from Fr. octogénaire "aged 80," from L. octogenarius "containing eighty," from octogen "eighty each," from octoginta "eighty," from octo "eight."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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

The American Heritage® Stedman's Medical Dictionary
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