The extent to which a system or device is operable.

plural of operativeness

(uncountable) The state or quality of being operative. / (countable) The result or product of being operative.

plural of oper

(Internet) A network operator on IRC.

(mathematics, logic) An operation on logical values that changes true to false, and false to true.

In an operative manner.

Of or relating to operations, especially military operations. / Functioning and ready for use. / Effective or operative. / Determined by means of practical measures.

(transitive or intransitive) To perform a work or labour; to exert power or strength, physical or mechanical; to act.

The method by which a device performs its function. / The method or practice by which actions are done. / The act or process of operating; agency; the exertion of power, physical, mechanical, or moral.