RhymeZone: that definitions

Definitions of that:

adverb: (degree) To a given extent or degree.
adverb: (degree) To a great extent or degree; very, particularly (in negative constructions).
adverb: (informal, Britain, Australia) To such an extent; so. (in positive constructions).
noun: (philosophy) Something being indicated that is there; one of those.

(Definitions from Wiktionary)