From The Collaborative International Dictionary of English v.0.48:
Modality \Mo*dal"i*ty\, n. [Cf. F. modalit['e].]
1. The quality or state of being modal.
[1913 Webster]
2. (Logic & Metaph.) A modal relation or quality; a mode or
point of view under which an object presents itself to the
mind. According to Kant, the quality of propositions, as
assertory, problematical, or apodeictic.
[1913 Webster]