different between twentyone vs thirty

English

Noun

twentyone (uncountable)

1. Alternative form of twenty-one

English

Alternative forms

• threety (obsolete or nonstandard); thirtie (obsolete)
• Arabic numerals: 30
• Roman numerals: XXX

Etymology

From Middle English thirty, metathetic alternant of Middle English thriti, þritti?, from Old English þriti? (“thirty”), from Proto-Germanic *þr?z tigiwiz (“thrity”, literally “three tens”), equivalent to three +? -ty. Cognate with Scots therty, tretty (“thirty”), West Frisian tritich (“thirty”), Dutch dertig (“thirty”), German dreißig (“thirty”).

Pronunciation

• (Received Pronunciation) IPA^(key): /????ti/
• (General American) enPR: th?r?t?, IPA^(key): /???ti/, [????i]
• Rhymes: -??(?)ti

Numeral

thirty

1. The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30.

Derived terms

• thirtysomething
• thirtyfold
• thirtyish
• thirtieth

Translations

See also

• (ordinal: the last of 30): thirtieth, trigesimal
• (adjectival form): tricenary
• (around 30): thirtyish
• (containing 30 of something): trigesimal
• (a 30-year-old person): tricenarian, thirtysomething
• (every 30 years): tricennial, trigintennial
• (30-sided figure): triacontahedron
• (30-sided): triacontahedral

Noun

thirty (plural thirties)

1. (slang) A rack of thirty beers.

References