Thir"ti*eth (?), a. [From Thirty: cf. AS. þrtigða.] 1. Next in order
after the twenty-ninth; the tenth after the twentieth; — the ordinal of
thirty; as, the thirtieth day of the month.
2. Constituting or being one of thirty equal parts into which anything
is divided.
Thir"ti*eth, n. The quotient of a unit divided by thirty; one of thirty
equal parts.
Thir"ty (?), a. [OE. thritty, AS. þrtig, þrittig; akin to D. dertig, G.
dreissig, Icel. þrjtu, þrjtigi, þrir teger, Goth. þreis tigjus, i.e.,
three tens. See Three, and Ten, and cf. Thirteen.] Being three times
ten; consisting of one more than twenty-nine; twenty and ten; as, the
month of June consists of thirty days.
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Thir"ty (?), n.; pl. Thirties (&?;). 1. The sum of three tens, or
twenty and ten; thirty units or objects.