(programming, informal) A binary operator that returns its first operand if that operand evaluates to true, and otherwise evaluates and returns its second operand.

(geometry, differential geometry) The differential of the Gauss map of an oriented surface at a given point on the surface.

Relating to, or characteristic of, the genre of horse opera.

(rail transport) The operation of a train without a conductor or guard as a cost-cutting measure; one-man operation.

(computing) synonym of comparison operator

(computing) a binary operator that tests for equality or inequality and evaluates to true or false

(programming) synonym of ternary operator

operations research

The spiritual effect in the performance of a religious rite that is ascribed chiefly or exclusively to the disposition of the recipient.

(physics) A differential operator which may be expressed as ∂_𝜇∂^𝜇=∑_(𝜇=0)³∂/∂x^𝜇∂/∂x_𝜇; it is the four-dimensional (Minkowski space) equivalent of the three-dimensional Laplace operator.