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modal logic

noun
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 See also alethic, deontic, epistemic, doxastic
3.
any formal system capable of being interpreted as a model for the behaviour of such concepts
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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