Definition of: probability

(prob′ə·bil′ə·tē) noun plural ·ties
1. The state or quality of being probable; likelihood; also, a probable event or statement.
2. Stat. The ratio of the chances favoring an event to the total number of chances for and against it. [<F probabilité <L probabilitas, -tatis <probabilis. See PROBABLE.] Synonyms: chance, credibility, likelihood, likeliness, presumption, verisimilitude. Antonyms: doubt, dubiousness, impossibility, improbability, inconceivability, inconceivableness, unlikelihood.