Etymology

thirty

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Today it means: The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30. Full definition →

Middle English thirty ← Old English þrītiġ ← Proto-Germanic *þrīz tigiwiz
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The story

  1. Proto-Germanic · inherited from*þrīz tigiwiz“thirty”
  2. Old English · inherited fromþrītiġ
  3. Middle English · inherited fromthirty
  4. English todaythirty

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

Etymology from Wiktionary, CC BY-SA 4.0.