/moh dal"i tee/ , n. , pl. modalities .
1. the quality or state of being modal.
2. an attribute or circumstance that denotes mode or manner.
3. Also called mode . Logic. the classification of propositions according to whether they are contingently true or false, possible, impossible, or necessary.
4. Med. the application of a therapeutic agent, usually a physical therapeutic agent.
5. one of the primary forms of sensation, as vision or touch.
[ 1610-20; modalitas. See MODAL, -ITY ]