To bring or place under obligation, moral or legal; to hold by a constraining motive.
To bind or firmly hold to an act; to compel; to constrain; to bind to any act of duty or courtesy by a formal pledge.
Having relation to the grant or exercise faculty, or authority, privilege, license, or the like hence, optional; as, facultative enactments, or those which convey a faculty, or permission; the facultative referendum of Switzerland is one that is optional with the people and is necessary only when demanded by petition; facultative studies; - opposed to obligatory and compulsory, and sometimes used with to.
Of such a character as to admit of existing under various forms or conditions, or of happening or not happening, or the like;