(physics) A spectrum produced by a diffraction grating whose adjacent slits are one wavelength apart.

(law) A restraining order which expires at a specified point in time, in particular a restraining order issued prior to an inter partes hearing.

plural of zero-order hold

(mathematics) A mathematical model of the practical signal reconstruction done by a conventional digital-to-analog converter, describing the effect of converting a discrete-time signal to a continuous-time signal by holding each sample value for one sample interval.

plural of antisocial behaviour order

plural of first order of the day

(politics) An item of business that will be discussed before any other item on a particular day when a legislature is sitting.

plural of temporary restraining order

(retail) The sale of an item that is not stocked by ordering it from another company

plural of stop-loss order (alternative spelling of stop loss orders).