[ok-tuh-juh-nair-ee-uh n]
adjective Also oc·tog·e·nar·y [ok-toj-uh-ner-ee] /ɒkˈtɒdʒ əˌnɛr i/.
  1. of the age of 80 years.
  2. between 80 and 90 years old.
  1. 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 formsoc·to·ge·nar·i·an·ism, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for octogenarian

Contemporary Examples of octogenarian

Historical Examples of octogenarian

  • 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.


    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?

British Dictionary definitions for octogenarian


less commonly octogenary (ɒkˈtɒdʒɪnərɪ)

noun plural -narians or -naries
  1. a person who is from 80 to 89 years old
  1. of or relating to an octogenarian

Word Origin for octogenarian

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

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

octogenarian in Medicine


  1. Being between 80 and 90 years of age.
  1. 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.