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

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.

The extent to which a system or device is operable.

(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.