(Britain, informal) A court order forbidding publication of any information that could identify a child involved in legal proceedings.

(idiomatic) Exactly what is necessary or useful in a given situation; something very beneficial or desirable.

(surveying) An optimal network design within a computer. It involves choosing an optimal reference system and revolving it around a certain real number.

(set theory, order theory, loosely) A set that has a given, elsewhere specified partial order. / (set theory, order theory, formally) The ordered pair comprising a set and its partial order.

(set theory) A partial order.

(mathematics, rare) A total order.

plural of higher-order function

(computer science) A function that takes one or more functions as an input, and returns a function as a result.

Alternative spelling of stop loss order

(logic) A formal deductive system extended from propositional logic with the possibility to quantify over individuals of the domain of discourse.