modal

adjective

• 1of or relating to mode or form as opposed to substance.

• 2 Grammar of or denoting the mood of a verb.
• relating to a modal verb.

• 3 Statistics of or relating to a mode; occurring most frequently in a sample or population.

• 4 Music of or denoting music using melodies or harmonies based on modes other than the ordinary major and minor scales.

• 5 Logic (of a proposition) in which the predicate is affirmed of the subject with some qualification, or which involves the affirmation of possibility, impossibility, necessity, or contingency.

noun

• a modal word or construction.