noun pl. modalities -·ties

1. the fact, state, or quality of being modal
2. a special attribute, emphasis, etc. that marks certain individuals, things, groups, etc.
3. Logic the qualification in a proposition that indicates that what is affirmed or denied is possible, impossible, necessary, contingent, etc.
4. Med.
   1. the employment of, or the method of employment of, a therapeutic agent
   2. a specific sensory channel, as vision or hearing

Etymology: ML modalitas