(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.

(programming, informal) The operator := that assigns values to variables in certain programming languages.

(nautical, military) The maximum depth at which a submarine is permitted to operate when actively engaged in battle.

plural of operating depth

(engineering) A mechanical task requiring relatively little skill.

plural of screwdriver operation

(construction) (This entry is a translation hub.)

Alternative form of nonoperating

A person who operates machinery.

A person who operates a forklift.