asynchronous

adjective

• 1not existing or occurring at the same time.

• 2 Computing & Telecommunications controlling the timing of operations by the use of pulses sent when the previous operation is completed rather than at regular intervals.

• 3(of a machine or motor) not working in time with the alternations of current.

• 4 Astronomy (of a satellite) revolving round the parent planet at a different rate from that at which the planet rotates.