asynchronous

Concise Oxford English Dictionary © 2008 Oxford University Press:
asynchronous/eɪˈsɪŋkrənəs/

▶adjective

• 1 not existing or occurring at the same time.

• 2 Computing & Telecommunications making use of pulses to control the timing of operations that are 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.

– derivatives
asynchronously adverb,
asynchrony noun.