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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.
Origin of octogenarian
1805-15; < Latin octōgēnāri(us) comprising eighty, eighty years old (equivalent to octōgēn(ī) eighty each + -ārius -ary) + -an
Related forms
octogenarianism, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for octogenarian
Contemporary Examples
Historical Examples
  • The octogenarian, in his downfall, is bitterly storming against his enemies.

    Blood and Iron John Hubert Greusel
  • Old Elmer was thirty-seven, and Nicky regarded him as an octogenarian.

    Gigolo Edna Ferber
  • I have found that their octogenarian memories are not always to be trusted.

  • The octogenarian loves to read about people of ninety and over.

    Over the Teacups Oliver Wendell Holmes, Sr.
  • Is not that a face which might make an octogenarian forget that he is not a boy?

    What Will He Do With It, Complete Edward Bulwer-Lytton
British Dictionary definitions for octogenarian


noun (pl) -narians, -naries
a person who is from 80 to 89 years old
of or relating to an octogenarian
Word Origin
C19: from Latin octōgēnārius containing eighty, from octōgēnī eighty each
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for 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.

Online Etymology Dictionary, © 2010 Douglas Harper
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octogenarian in Medicine

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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