plural of order of precedence

(music) A large harmonium used instead of a pipe organ.

plural of organ harmonium

Conforming to paleo-orthodoxy

plural of second-order logic

(informal) Used to indicate that something is the case and cannot be altered even if the listener does not want it to be the case.

(of troops etc.) in an arrangement in compact units at close intervals and distances, as for marching and/or drill.

Alternative form of or something

plural of organ system

(biology) A group of organs that work together as a biological system to perform one or more functions.