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Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any formal system that attempts to deal with modalities, such as possibility and necessity, but also obligation and permission.

from the GNU version of the Collaborative International Dictionary of English

  • n. A system of logic which studies how to combine propositions which include the concepts of necessity, possibility, and obligation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the logical study of necessity and possibility
  • n. a system of logic whose formal properties resemble certain moral and epistemological concepts

Etymologies

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