certainly, sure (said when granting a request) / no thanks is necessary; you're welcome (said in response to an expression of gratitude)

(dictionaries, text messaging) Clipping of probably.

(informal) Clipping of problem.

An observation that contradicts an accepted law or theory.

A mental representation of a particular problem, including initial, final and possible intermediate states

(mathematics) A measurable space having a unit measure

(space science) A robotic space vehicle designed to voyage beyond Earth's orbit.

(mathematics) A function that gives the relative probability that a discrete random variable is exactly equal to some value.

(probability theory) Any function whose integral over a set gives the probability that a random variable has a value in that set

(mathematics) the probability that a certain outcome will occur, as determined through reasoning or calculation.