#1 possibility n. a future prospect or potential; "this room has great possibilities". wn
#2 possibility n. [possibleness] capability of existing or happening or being true; "there is a possibility that his sense of smell has been impaired". wn
#3 possibility n. [hypothesis, theory] 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. wn
#4 possibility n. [possible action, opening] a possible alternative; "bankruptcy is always a possibility". wn
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