Parliamentary (adjective)

1. Of, relating to, or characteristic of a parliament or parliamentary system of government.
2. Conducted or carried out in a parliament or by a parliament.
3. Consisting of or based on the decisions or actions of a parliament.

Origin:

From parliament +‎ -ary.

Examples:

1. The parliamentary committee is investigating the issue.
2. The parliamentary debate lasted for several hours.
3. The country has a parliamentary democracy.