Home › Words › O › octogenarianismoctogenarianismoctogenarianism · noun — the state or condition of being an octogenarian.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom octogenarian + -ism.nounThe state or condition of being an octogenarian.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.octogenarian 77% match — Synonym of eightysomething: a person between 80 and 89 years old. vs octogenarianism →eightysomething 65% match — An indeterminate value between 80 (inclusive) and 90 (exclusive). vs octogenarianism →centenarianism 61% match — The state of being at least 100 years of age. vs octogenarianism →nonagenarian 60% match — Synonym of ninetysomething: a person between 90 and 99 years old. vs octogenarianism →agedness 59% match — The state or quality of being aged. vs octogenarianism →octocentennial 57% match — Relating to an octocentenary vs octogenarianism →octonarian 56% match — Composed of eight metrical feet vs octogenarianism →gerontic 56% match — Of or pertaining to old age or the elderly. vs octogenarianism →