Etymology

that's

Today it means: That is. Full definition →

English that ← Middle English that ← Old English þæt
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that's · contraction1

From that + 's (contraction of words ending in s).

that's · determiner2

  1. Proto-Indo-European*tód
  2. Proto-Germanic*þod
  3. Proto-Germanic*þat
  4. Proto-West Germanic*þat
  5. Old Englishþæt
  6. Middle Englishthat
  7. Englishthat
  8. English todaythat's

From that + -'s (possessive marker).

Etymology from Wiktionary, CC BY-SA 4.0.