Definition of that adverb from the Oxford Advanced Learner's Dictionary

     

    that

     adverb
    adverb
    BrE BrE//ðæt//
     
    ; NAmE NAmE//ðæt//
     
     
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  1. 1used when saying how much or showing how long, big, etc. something is with your hands I can't walk that far (= as far as that). It's about that long.
  2. 2not (all) that not very, or not as much as has been said It isn't all that cold. There aren't that many people here.
  3. 3(British English, informal) used to emphasize how much I was that scared I didn't know what to do.
  4. Word Origin Old English thæt, nominative and accusative singular neuter of se ‘the’, of Germanic origin; related to Dutch dat and German das.
See the Oxford Advanced American Dictionary entry: that