The extent to which a system or device is operable.

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

In an operative manner.

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.

Obsolete form of operose.

The act of operating or working; operation.

operativeness