—adj.
1 capable of existing or happening; that may be managed, achieved, etc. (came as early as possible; did as much as possible).
2 that is likely to happen etc. (few thought their victory possible).
3 acceptable; potential (a possible way of doing it).
—n.
1 a possible candidate, member of a team, etc.
2 (prec. by the) whatever is likely, manageable, etc.
3 the highest possible score, esp. in shooting etc.
Etymology: ME f. OF possible or L possibilis f. posse be able
Useful english dictionary. 2012.