1. nonagenary - Noun
2. nonagenary - Adjective
nonagenary (not comparable)
(rare) Of or related to the number ninety.
Coordinate terms: unary, binary, ternary, trinary, tetranary, quintenary, hexanary, septenary, octonary, nonary, decenary, vicenary, tricenary, quadragenary, quinquagenary, semicentenary, sexagenary, septuagenary, octogenary, centenary, millenary
nonagenary (plural nonagenaries)
(astronomy, astrology, obsolete) Synonym of square or quadrature: a rising at a 90 degree angle to the position of another heavenly body, particularly the sun.