A sudden, involuntary contraction of a muscle, a group of muscles, or a hollow organ. / A violent, excruciating seizure of pain. / A sudden and temporary burst of energy, activity, or emotion.

To produce and undergo a spasm or series of spasms.

(idiomatic, colloquial, vulgar) To masturbate (male).

(transitive) To beat, smack or slap a person's buttocks, with the bare hand or other object, as punishment, gesture, or form of sexual interaction. / (transitive) To soundly defeat, to trounce.

An instance of spanking, separately or part of a multiple blows-beating; a smack, swat, or slap. / A slapping sound, as produced by spanking.

A health resort near a mineral spring or hot spring. / A trendy or fashionable resort. / A health club. / A hot tub. / (dialect) A convenience store.

(Ireland, slang) A clumsy person (see spastic) / (Ireland, slang) An idiot / (Ireland, slang) A gobshite

(functional analysis) A generalized Euclidean space in which mathematical functions take the place of points; crucial to the understanding of quantum mechanics and other applications.

(algebra, geometry, mathematics, topology) A set of elements called vectors, together with some field and operations called addition (mapping two vectors to a vector) and scalar multiplication (mapping a vector and an element in the field to a vector), satisfying a list of constraints.

(idiomatic) The difference between the cost of the fuel required to produce a unit of electricity, and the price of that same unit of electricity.