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.
Not obligate; optional, discretionary or elective.
At which a given function is positive.
Giving permission, or predisposed to give it; lenient.
That allows the replication of viruses.
Open to the public by permission of the landowner.