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⇱ modal logic - WordReference.com Dictionary of English

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modal logic

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Collins Concise English Dictionary © HarperCollins Publishers::

modal logic n

the logical study of such philosophical concepts as necessity, possibility, contingency, etc
the logical study of concepts whose formal properties resemble certain moral, epistemological, and psychological concepts
See also deontic

'modal logic' also found in these entries (note: many are not synonyms or translations):

deontic - modality

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