that's

Meanings

1. 1
   contraction

   a contraction of that is

   That's the book I was looking for.

2. 2
   contraction

   a contraction of that has when has is an auxiliary verb

   That’s been the rule for many years.

A contraction of that + is or has. The apostrophe marks sounds omitted from the following auxiliary, while the pronunciation reduces the two words to one syllable.

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