Etymology

thousandth

thou·sandth
T1H4O1U1S1A1N1D2T1H4

Today it means: The ordinal numeral form of one thousand; last in order of a series of a thousand; next after the nine hundred and ninety-ninth. Full definition →

English thousand ← Middle English thousend ← Old English þūsend
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The story

  1. Proto-Indo-European*tewh₂-?
  2. Proto-Indo-European*déḱm̥?
  3. Proto-Indo-European*déḱm̥
  4. Proto-Indo-European*ḱm̥tóm?
  5. Proto-Indo-European*tuHsont-
  6. Proto-Germanic*þūsundī
  7. Proto-West Germanic*þūsundi
  8. Old Englishþūsend
  9. Middle Englishthousend
  10. Englishthousand
  11. English todaythousandth

From thousand + -th (suffix forming an ordinal number).

Etymology from Wiktionary, CC BY-SA 4.0.