octogenarian

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.

noun

3. a person who is between 80 and 90 years old.

noun plural -narians or -naries

1. a person who is from 80 to 89 years old

adjective

2. of or relating to an octogenarian

n.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. adj.

1. Being between 80 and 90 years of age.

n.

1. A person between 80 and 90 years of age.