1 of, relating to, or characteristic of mode or manner
2 (Grammar) (of a verb form or auxiliary verb) expressing a distinction of mood, such as that between possibility and actuality. The modal auxiliaries in English include can, do, may, must, need, ought, shall, should, will, and would
a qualifying or expressing a qualification of the truth of some statement, for example, as necessary or contingent
b relating to analogous qualifications such as that of rules as obligatory or permissive
4 (Metaphysics) of or relating to the form of a thing as opposed to its attributes, substance, etc.
5 (Music) of or relating to a mode
6 of or relating to a statistical mode
1 the logical study of such philosophical concepts as necessity, possibility, contingency, etc.
2 the logical study of concepts whose formal properties resemble certain moral, epistemological, and psychological concepts
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3 any formal system capable of being interpreted as a model for the behaviour of such concepts
English Collins Dictionary - English Definition & Thesaurus
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