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

adjective Also oc·tog·e·nar·y [ok-toj-uh-ner-ee] /ɒkˈtɒdʒ əˌnɛr i/.

of the age of 80 years.
between 80 and 90 years old.


a person who is between 80 and 90 years old.


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Origin of octogenarian

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

OTHER WORDS FROM octogenarian

oc·to·ge·nar·i·an·ism, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for octogenarian

British Dictionary definitions for octogenarian


less commonly octogenary (ɒkˈtɒdʒɪnərɪ)

/ (ˌɒktəʊdʒɪˈnɛərɪən) /

noun plural -narians or -naries

a person who is from 80 to 89 years old


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

Medical definitions for octogenarian

[ ŏk′tə-jə-nârē-ən ]


Being between 80 and 90 years of age.


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.