What does octogenary mean?
Octogenary is a rare word relating to the eighth decade of life or, more broadly, to the age of eighty. As an adjective, it can describe an octogenarian, as in “an octogenarian author,” or something associated with a person in their eighties. As a noun, it denotes such a person, although the standard modern term is octogenarian. The word is chiefly formal and literary, and using it may sound deliberately traditional or slightly archaic. Its value is chiefly historical and stylistic: it provides a concise way to refer to someone in their eighties while distinguishing the adjective from the more familiar noun. In ordinary conversation and contemporary prose, “octogenarian” is almost always clearer and more natural, while “eighty-year-old” is often the most direct description.
Relating to the age of eighty or to people in their eighties.
"The octogenary pianist gave a remarkable concert in her eighty-fourth year."
Rare and often literary; “eighty-year-old” is more usual in modern English.
A person in their eighties.
"One octogenary recalled the arrival of electricity in her village."
Very rare; “octogenarian” is the conventional modern term.
The plural is rarely needed because the noun itself is uncommon.
"The documentary portrayed several octogenaries who had built careers in the early twentieth century."
Both octogenary and the familiar octogenarian point back to the Latin numeral for eighty, making octogenary an older-looking relative of a familiar word.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does octogenary come from?
Octogenary entered English from the Latin octogenarius, meaning “eightieth” or “of eighty years old.” The Latin term was formed from octoginta, meaning “eighty,” which in turn combines the numeral eight with a suffix meaning “twenty.” Modern octogenarian comes from the same Latin family, explaining the close similarity in meaning and spelling.
How octogenary is actually used
The noun is very rare in contemporary English; octogenarian is normally preferred. The adjective can sound formal, dated, or literary, especially when used as a label rather than in ordinary description.
Easily confused with octogenary
Octogenarian is the standard modern noun for a person aged eighty to eighty-nine, whereas octogenary is a much rarer adjective and noun.