Something being indicated that is there; one of those.
To a given extent or degree.
Introducing a clause which is the subject or object of a verb (such as one involving reported speech), or which is a complement to a previous statement.
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.
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 word "that" comes from Old English þæt, which originally meant "the" or served as a relative pronoun. It traces its roots back to Proto-Germanic þat and ultimately to the Proto-Indo-European root tód.