facultative
Pronunciation:
/ˈfæ.kəl.tə.tɪv//ˈfæ.kəlˌteɪ.tɪv/adjective
Definitions
Of or relating to faculty, especially to mental faculty
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