Possibilities can be explained from several semantic aspects. One way to explain possibility is ease of achievement. Another way is plausibility; that is, the propensity of an event to occur, which relates to the concept of “potential surprise”. A third way to explain possibility is logical consistency with available information. Finally, possibility can be explained as preference, referring to the willingness of an agent to make a decision. Possibility is dually related to necessity in the sense that “not A” being not possible means that A is necessary. A semantic analysis of necessity can be done through reference to.
