Modality \Mo*dal"i*ty\, n. [Cf. F. modalit['e].]

1. The quality or state of being modal.

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.

Source: Webster's Revised Unabridged Dictionary (1913)