thirty – Wiktionary

English

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Alternative forms

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• threety

  (

  obsolete or nonstandard

  )

  ; thirtie

  (

  obsolete

  )

• Arabic numerals: 30
• Roman numerals: XXX

Etymology

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From Middle English thirty, metathetic alternant of Middle English thriti, þrittiȝ, from Old English þrītiġ (“thirty”), from Proto-Germanic *þrīz tigiwiz (“thirty”, literally “three tens”), equivalent to three +‎ -ty.[1][2] Cognate with Scots therty, tretty (“thirty”), West Frisian tritich (“thirty”), Dutch dertig (“thirty”), German dreißig (“thirty”).

Pronunciation

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Numeral

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thirty

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

   • For quotations using this term, see Citations:thirty

Derived terms

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Translations

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See also

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• (

  ordinal: the last of 30

  )

  :

  thirtiethtrigesimal

• (

  adjectival form

  )

  :

  tricenary

• (

  around 30

  )

  :

  thirtyish

• (

  containing 30 of something

  )

  :

  trigesimal

• (

  a 30-year-old person

  )

  :

  tricenarianthirtysomething

• (

  every 30 years

  )

  :

  tricennialtrigintennial

• (

  30-sided figure

  )

  :

  triacontahedrontriacontagon

• (

  30-sided

  )

  :

  triacontahedral

Noun

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thirty (plural thirties)

1. (

   slang

   )

   A rack of thirty beers.

References

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