a possible alternative "bankruptcy is always a possibility" - possible action
a tentative insight into the natural world
a concept that is not yet verified but that if true would explain certain facts or phenomena "a scientific hypothesis that survives experimental testing becomes a scientific theory" "he proposed a fresh theory of alkalis that later was accepted in chemical practices"
capability of existing or happening or being true "there is a possibility that his sense of smell has been impaired" - possibleness
a future prospect or potential "this room has great possibilities"