parliamentary

1. Of, relating to, or resembling a parliament.
2. Enacted or decreed by a parliament.
3. Being in accord with the rules and customs of a parliament.
4. 1. Having a parliament.
   2. Characterized by an executive branch consisting of cabinet ministers selected from and responsible to the parliament: parliamentary government.

The adjective has 3 meanings:

Meaning #1: relating to or having the nature of a parliament
  Pertains to noun: parliament (meaning #1)

Meaning #2: having the supreme legislative power resting with a body of cabinet ministers chosen from and responsible to the legislature or parliament

Meaning #3: in accord with rules and customs of a legislative or deliberative assembly