Anything cyclical. If your freestyling, you rap in a cypher (one after the other). Interrupting another man will break that cypher (unless he's next in line and the dude behind him is falling off). The same concept applies to burning; there is a set order to who hits next (pass it to the left my friends). Never break the damn cipher

The process of tapping into your subconcious. A state of mind where thoughts and actoins flow from your mind rather than being instrumented.
Clearly shown in freestyle/beatbox circles and breakdancing.

To freestyle but not in battle terms

a circle in which gang members form to conduct meetings and or sometimes to do drugs such as weed.

You crack heads its not to matrix shit and it prolly is rapping but the only Cypher I know is the rotation of a joint or a pipe (Smoking apparatus) which it is being pass around (Left)

Cypher, or just cyph. The cycle in which drugs(mainly weed) is being passed.

the number 0, a circle or hole