A room in a hospital used for performing surgery (originally designed for operations in front of observers).

A room in a hospital used for performing surgical operations.

(mathematics) The sequence in which the various operations in a mathematical expression are to be evaluated.

Operated, or activated, by placing coins in a slot.

plural of operating system

Any simple step in a multi-step chemical engineering process; examples include distillation, evaporation, mixing, filtration, crystallization etc.

present participle of co-operate

simple past tense and past participle of cooperate

Third-person singular simple present indicative form of co-operate

Alternative spelling of cooperatively