1 the state or condition of being probable.
2 the likelihood of something happening.
3 a probable or most probable event (the probability is that they will come).
4 Math. the extent to which an event is likely to occur, measured by the ratio of the favourable cases to the whole number of cases possible.
Phrases and idioms:
in all probability most probably.
Etymology: F probabiliteacute or L probabilitas (as PROBABLE)
Useful english dictionary. 2012.