Definition of probability

• n. - The quality or state of being probable; appearance of reality or truth; reasonable ground of presumption; likelihood.
• n. - That which is or appears probable; anything that has the appearance of reality or truth.
• n. - Likelihood of the occurrence of any event in the doctrine of chances, or the ratio of the number of favorable chances to the whole number of chances, favorable and unfavorable. See 1st Chance, n., 5.