possibility in WordNet English dictionary

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