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.
Requiring a (specified) way of life, habitat, etc..
Indispensable; essential; necessary; obligatory; mandatory; unavoidably invoked.
To bind, compel, constrain, or oblige by a social, legal, or moral tie.
To commit (money, for example) in order to fulfill an obligation.
To cause to be grateful or indebted; to oblige.