conj

• Introducing a clause that is the subject of a verb, especially the 'be' verb or a verb expressing judgement, opinion, etc.
  "That she will come is almost certain."
• (dated) Introducing a subordinate clause that expresses an aim, purpose, or goal ("final"), and usually contains the auxiliaries may, might, or should: so, so that, in order that.
  "He fought that others might have peace."
• (archaic or poetic) Introducing a premise or supposition for consideration: seeing as; inasmuch as; given that; as would appear from the fact that.
  "What are you mad, that you doe reaſon ſo?"
• (archaic or poetic) Introducing an exclamation expressing a desire or wish.
  "Oh that spring would come!"

det

• (demonstrative) The (thing, person, idea, etc) indicated or understood from context, especially if more remote physically, temporally or mentally than one designated as "this", or if expressing distinction.
  "That book is a good read. This one isn't."

pron

• (demonstrative) The thing, person, idea, quality, event, action, or time indicated or understood from context, especially if more remote geographically, temporally or mentally than one designated as "this", or if expressing distinction.
  "That's my car over there."
• (demonstrative) The thing, person, idea, quality, event, action, or time indicated or understood from context, especially if more remote geographically, temporally or mentally than one designated as "this", or if expressing distinction.
  "They're getting divorced. What do you think about that?"
• (demonstrative) The thing, person, idea, quality, event, action, or time indicated or understood from context, especially if more remote geographically, temporally or mentally than one designated as "this", or if expressing distinction.
  "The water is so cold! — That it is."
• (relative, plural that) In a relative clause, referring to a previously mentioned noun, as subject, direct object, indirect object, or object of a preposition; which, who.
  "I didn't see the car that hit me."

adv

• (degree) To a given extent or degree.
  "Here's the measurement – the ribbon must be that long, no longer and no shorter."
• (degree) To a given extent or degree.
  "She said we waited for three hours, but I'm sure it wasn't that long."
• (degree, in negative constructions) To a great extent or degree; very, particularly.
  "I was seen quite quickly — I didn't have to wait that long."
• (informal, British, Australia, in positive constructions) To such an extent; so.
  "Ooh, I was that happy I nearly kissed her."