nonagenary

== English == === Etymology === From Latin nōnāgēnārius (“containing 90”) either directly or via Middle French nonagénaire, from Latin nōnāgēnī (“90 each”) + -ārius (“-ary”), from nōnāgintā (“nine tens, 90”). === 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 === Noun === 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. === References === “† nonagenary, n.”, in OED Online ⁠, Oxford: Oxford University Press, 2021.