operation >> ɒpəˈreɪʃ(ə)n
Definition: [noun] the action of functioning or the fact of being active or in effect.
Example: restrictions on the operation of market forces
Definition: [noun] an act of surgery performed on a patient.
Example: I've never felt better since my bypass operation
Definition: [noun] an organized activity involving a number of people.
Example: a rescue operation
Definition: [noun] a process in which a number, quantity, expression, etc., is altered or manipulated according to set formal rules, such as those of addition, multiplication, and differentiation.