Modal /(?)/

Mo·dal

Modal

a.
  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.
  2. Indicating, or pertaining to, some mode of conceiving existence, or of expressing thought, such as the modes of possibility or obligation. (Logic & Metaph.)
  3. Pertaining to or denoting mood. (Gram.)

Modal

n.
  1. A modal auxiliary. (Gram.)