Modal
Modal , adjective
[Compare French modal. See Mode.]
1.
Of or pertaining to a mode or mood; consisting in mode or form only; relating to form; having the form without the essence or reality. — Glanvill
2.
(Logic & Metaphysics) Indicating, or pertaining to, some mode of conceiving existence, or of expressing thought, such as the modes of possibility or obligation.
3.
(Grammar) Pertaining to or denoting mood.
Modal , noun
(Grammar) A modal auxiliary.