A Quick and Simple Dictionary

that

1. Conjunction.  (non-gloss definition, Connecting noun clause (as involving reported speech etc.); introducing a subordinate noun clause.) (defdate, from 9th c.) .
2. Conjunction.  (archaic) Introducing a hypothetical fact or supposition: ‘given that’, ‘as would appear from the fact that’. (defdate, from 11th c.) .
3. Conjunction.  With antecedent (term, so) or (term, such) : introducing the result of the main clause. (defdate, from 11th c.) .
4. Conjunction.  (archaic) Without any antecedent: so that. (defdate, from 12th c.) .
5. Determiner.  The (thing) being indicated (at a distance from the speaker, or previously mentioned, or at another time).
6. Pronoun.  (context, demonstrative) That thing.
7. Pronoun.  (context, relative) Which, who.
8. Adverb.  (context, degree) To a given extent or degree; particularly.
9. Adverb.  (dialect, _) So, so much; very.
10. Adverb.  (dialect) indeed.