Thirty

Pronunciation

• RP IPA: /ˈθɜːti/
• GenAm IPA: /ˈθɝti/,

Alternative forms

• threety

Origin

From Middle English thirty, metathetic alternant of Middle English thritti, þrittiȝ, from Old English þritiġ ("thirty"), from Proto-Germanic *þrīz tigiwiz ("thrity", literally three tens), equivalent to three + -ty.

Merriam Webster Online

Dictionary.com

Cognate with Scots therty, tretty ("thirty"), West Frisian tritich ("thrity"), Dutch dertig ("thrity"), German dreißig ("thirty").

Numeral

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

Related terms

• thirtieth (ordinal number)

Derived terms

• thirtysomething
• one thirty

Full definition of thirty

Noun

1. (slang) A rack of thirty beers.