thirty (a.) Being three times ten; consisting of one more than
twenty-nine; twenty and ten; as, the month of June consists of thirty
days.
thirty (n.) The sum of three tens, or twenty and ten; thirty units or
objects.
thirty (n.) A symbol expressing thirty, as 30, or XXX.
OmegaWiki DictionaryOmegaWiki DictionaryΩ
thirty The cardinal number occurring after twenty-nine and before thirty-one, represented in Roman numerals as XXX and in Arabic numerals as 30.
Chambers DictionaryChamber's 20th Century Dictionary📕
thirty thėr′ti, adj. and n. three
times ten.—adj.Thir′tieth, the last of
thirty.—n. a thirtieth part. [A.S.
thrítig—threó, three, -tig, suff. denoting ten.]
Wikipedia
Thirty is the number that is after twenty-nine and before thirty-one.
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