nonagenarian [non-uh-juh-nair-ee-uh n, noh-nuh-]
1. of the age of 90 years, or between 90 and 100 years old.
2. a nonagenarian person.
Origin: 1795-1805; < Latin nōnāgēnāri (us) containing ninety, consisting of ninety ( nōnāgēn (ī) ninety each + -ārius -ary ) + -an
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