Peremptory Law and Legal Definition

Peremptory means something definite and absolute, final and not entitled to delay or reconsideration. The term is applied to writs, juror challenges or a hearing date. It is also used in a derogatory sense to refer to a commanding, bossy person. Someone who is offensively self-assured, rather aggressive and dominating may be described as doing something in a peremptory manner.

A peremptory norm is a basic principle of international law generally accepted among the international community of states as a whole. Unlike ordinary customary law that has traditionally required consent and allows the alteration of its obligations between states through treaties, peremptory norms cannot be violated by any state.