A legally binding directive—issued by a court of law, legislature, or other authority—that requires workers who are engaging in a strike or similar labor action to return to work.

(set theory) A set having a specified total order.

(Catholicism) The religious order of friars established by St Francis of Assisi.

plural of ℝ-order tree

(topology) An order tree whose segments are homeomorphic to segments of the real line and that is the union of countably many segments.

plural of totally ordered set

plural of partial ordering relation

plural of partially ordered set

plural of total ordering relation

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