(mathematics) The probability that a certain outcome will occur, as determined through experiment.

(computer science) The problem of deciding in finite time whether a given program will finish running in finite time, when given a certain finite input.

(US, humorous) Used to report that a (major) problem has occurred.

(probability theory) The mathematics problem that concerns the probability there exist two people in a random group who share a birthday.

A problem that has been posed in a field of study such as mathematics or theoretical computer science, but whose answer is not yet known.

(programming) A problem dealing with how to treat the initial or boundary values of a discrete problem.

plural of open problem

One who is on probation. / (Scotland) One who is licensed to preach, but not ordained to a pastorate.

(mathematics) A mathematical problem in which lines drawn from two points in the plane of a circle must meet at a point on the circumference, making equal angles with the normal at that point.

To solve problems.