(mechanics) A parallelogram, two adjacent sides of which are vectors having the same initial point and representing two forces acting simultaneously upon this point, such that the resultant of the forces is given by the diagonal of the parallelogram that passes through this point.

(complex analysis) Of a complex number a + bi, where a and b are real numbers, the value b.

(complex analysis) Of a complex number a + bi, the value a.

A value kept constant during an experiment, equation, calculation or similar, but varied over other versions of the experiment, equation, calculation, etc.

A Euro-sceptic political party in the United Kingdom.

(Britain) A bachelor party; a party held for a man who is about to be married.

(Britain) A bachelorette party; a party held for a woman who is about to be married.

(US, Canada) A party held for a woman who is about to be married.

(US, Canada, South Africa) A party held for a man who is about to be married, normally attended only by male friends and relatives.

Forgiveness for an offence.