of or pertaining to mode, manner, or form.

Music .

pertaining to mode, as distinguished from key.

based on a scale other than major or minor.

Also, single modal. Transportation . pertaining to or suitable for transportation involving only one form of a carrier, as truck, rail, or ship. Compare bimodal ( def. 3 ) , intermodal.

Grammar . noting or pertaining to mood.

Philosophy . pertaining to a mode of a thing, as distinguished from one of its basic attributes or from its substance or matter.

Logic . exhibiting or expressing some phase of modality.

modal auxiliary.