Epistemic modality

Epistemic modality refers to the conveyance of the speaker’s attitude toward the factualness of a proposition.

Examples
Sentences such as “John may be in his office” or “Mary could be at school by now” (Palmer 2001:26, 32) are examples of the expression of epistemic modality.

Comments
Traditionally, epistemic modality and deontic modality were considered the major subdivisions of modality. Palmer (2001) prefers to classify epistemic and evidential as the major subdivisions of “propositional modality.” According to Bybee, Perkins, and Pagliuca (1994: 176-181), epistemic is one of four major types of modality, along with agent-oriented modality, speaker-oriented modality, and subordinate modality.

Other languages
German epistemische Modalität