modal logic

1. 1.

   the logical study of necessity and possibility

   Broaderlogic
2. 2.

   a system of logic whose formal properties resemble certain moral and epistemological concepts

   Broadersymbolic logic

   Narroweralethic logicdeontic logicepistemic logicdoxastic logic

Questions about modal logic

What does modal logic mean?

modal logic means "the logical study of necessity and possibility". That is the primary sense; the word has 2 in total, listed in full on this page.

Is modal logic a common word?

modal logic is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.