Definitions for modal logic
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Princeton's WordNet
modal logic(noun)
the logical study of necessity and possibility
modal logic(noun)
a system of logic whose formal properties resemble certain moral and epistemological concepts
Wiktionary
modal logic(Noun)
Any formal system that attempts to deal with modalities, such as possibility and necessity, but also obligation and permission.
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"modal logic." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/modal logic>.

