1. indicates word or phrase being defined (Colloquial)

2. used for quoting (thoughts, speech, etc.) (Colloquial, indicates contrast or adds emphasis to a negative statement)

3. with (Colloquial, more emphatic than と)

4. (not) as much as; (not) so much as (Colloquial, with neg. verb)

5. the fact that; to think that; such a thing as (Colloquial, indicates surprise, disbelief, anger, etc.; sometimes at sentence end)