(probability theory) An event that contains all of the possible outcomes and thus is known a priori to be certain to occur; the entire sample space.

Not holy; (by extension) evil, impure, or otherwise perverted. / Dreadful, terrible, excessive, or otherwise atrocious.

plural of yachtman

Under the Whyte notation system, a steam locomotive, with five axles connecting ten powered driving wheels, and no leading wheels or trailing wheels.