**Type:** Word
**Level:** C2
**Part of speech:** noun, adj
**IPA (US):** /ˌɑktəd͡ʒɪˈnɛɹiən/
**IPA (UK):** /ˌɒktəd͡ʒɪˈnɛəɹɪən/
**Frequency rank:** 86719

## Meanings
1. A person between 80 and 89 years old.
2. Being between 80 and 89 years old.

## Examples
- The marathon was won, remarkably, by an octogenarian.
- The octogenarian author published her tenth novel this year.

## Roots and Affixes
- Root: octōgēnārius
- Root: octogénaire
- Root: octōgēnus

## Etymology
From Latin octōgēnārius + -an (suffix forming adjectives and representative nouns), either directly or via French octogénaire, from Latin octōgēnus (“80 each”) + -ārius (“-ary”), from octōgintā (“eight tens, 80”).

## AI Etymology
Octogenarian is from Latin octōgēnārius + -an (suffix forming adjectives and representative nouns), either directly or via French octogénaire, from Latin octōgēnus (“80 each”) + -ārius (“-ary”), from octōgintā (“eight tens, 80”). The analysis is mainly morphological: the modern form is built from the named base and affix. Important recorded forms include octōgēnārius (Latin), octogénaire (French), and octōgēnus (Latin). Current senses include a person between 80 and 89 years old and being between 80 and 89 years old.

## Topics
- Space, Position & Direction
- Word Formation & Derivatives

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