term:

Extraordinary

extraordinary adj

1 a : going beyond what is usual, regular, or customary
;specif
: of, relating to, or having the nature of a proceeding or action not normally required by law or not prescribed for the regular administration of law [an session of the legislature] [granted relief] compare ordinary
b : of or relating to a financial transaction that is not expected to be repeated [an charge against earnings] [an gain]
2 : employed for or sent on a special function or service [an ambassador ]

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.