operative >> ˈɒp(ə)rətɪv
Definition: [adjective] functioning or having effect.
Example: the transmitter is operative
Definition: [adjective] relating to surgery.
Example: wounds needing operative treatment
Definition: [noun] a worker, especially one in a manufacturing industry.
Example: the operatives clean the machines at the end of every shift
Definition: [noun] a secret agent or private detective.
Example: a CIA operative