THIRTY
thirty, xxx
(adjective) being ten more than twenty
thirty, XXX
(noun) the cardinal number that is the product of ten and three
Source: WordNet® 3.1
Etymology
Numeral
thirty
The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30.
Noun
thirty (plural thirties)
(slang) A rack of thirty beers.
Source: Wiktionary
Thir"ty, a. Etym: [OE. thritty, AS. Þritig, Þrittig; akin to D.
dertig, G. dreissig, Icel. Þrjatiu, Þrjatigi, Þrir teger, Goth. Þreis
tigjus, i.e., three tens. See Three, and Ten, and cf. Thirteen.]
Definition: Being three times ten; consisting of one more than twenty-nine;
twenty and ten; as, the month of June consists of thirty days.
Thir"ty, n.; pl. Thirties (.
1. The sum of three tens, or twenty and ten; thirty units or objects.
2. A symbol expressing thirty, as 30, or XXX.
Source: Webster’s Unabridged Dictionary 1913 Edition