(slang) Not mentally sound; insane. / (idiomatic) Stupid.

(physics) The ratio between (1) the magnitude of the force of friction which a surface produces on an object (moving along the surface or being pressed statically against it) and (2) the magnitude of the normal force which is produced by the surface on the object and which is perpendicular to that surface.

(idiomatic) Having completed a task before it is due; ready, prepared, or anticipating.

plural of Member of Parliament

(literally) Fitting the melody of. / (idiomatic) Roughly; about; to the approximate sum or extent of.

(idiomatic) The limit of one’s patience, when one is so frustrated or annoyed that one can no longer cope. / (idiomatic) The point at which one has run out of options or the ability to delay.

The upper chamber of the UK's Houses of Parliament

(UK, humorous euphemistic slang, dated) A lavatory: a room used for urination and defecation. / (Scotland, humorous euphemistic slang, uncommon) A urinal.

(physics) The speed at which sound is propagated through some medium under specified conditions.

(chemistry) The water present in the crystals of the salts of certain metals; it is weakly bound by electrostatic forces and may normally be removed by heating.