Definition of modalities:
(n) :
(logic) The classification of propositions on the basis on whether they claim possibility, impossibility, contingency or necessity; mode.
(n) :
(grammar) The inflection of a verb that shows how its action is conceived by the speaker.
(n) :
(medicine) A method of diagnosis or therapy.
(n) :
The fact of being modal.
(n) :
Any of the senses (such as sight or taste)
(n) :
(semiotics) A particular way in which the information is to be encoded for presentation to humans, i.e. to the type of sign and to the status of reality ascribed to or claimed by a sign, text or genre.