Etymology

that is

Today it means: In other words; that is to say. Used to introduce a clarification or explanation Full definition →

Middle English that is
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The story

  1. Middle English · inherited fromthat is
  2. Middle English · inherited fromthat is
  3. English todaythat is

Inherited from Middle English that is, from Old English þæt is.

Etymology from Wiktionary, CC BY-SA 4.0.