(firearms) having a bore with a smooth interior, ie. one that has not been rifled

(statistics) A rival hypothesis to the null hypothesis. Their likelihoods are compared by a statistical hypothesis test.

(computing) Acronym of Relational Online Analytical Processing.

(mathematics) Any function whose value repeats after the regular addition of a period to its independent variable; i.e., a function ƒ such that, for some positive constant p, ƒ(x + p) = ƒ(x) for al...