Not obligate; optional, discretionary or elective.
That grants permission or power to do something.
Able to perform a particular life function, or to live generally, in more than one way.
Of or relating to faculty, especially to mental faculty.
At which a given function is positive.
Not dependent; not contingent or depending on something else; free.
Not affiliated with any political party.
Separate from; exclusive; irrespective.
Providing a comfortable livelihood.
Not subject to bias or influence; self-directing.
A team not affiliated with any league or conference.
A neutral or uncommitted person.
A candidate or voter not affiliated with any political party, a freethinker, free of a party platform.
A small, privately owned business.