synchronous

/ˈsiŋ-krə-nəs/

borrowed from Late Latin synchronos "contemporary," borrowed from Greek sýnchronos "existing at the same time," from syn- syn--chronos, adjective derivative of chrónos "time, duration," of obscure origin

adjective

  1. happening, existing, or arising at precisely the same time

  2. recurring or operating at exactly the same periods

  3. involving or indicating synchronism

contemporary contemporaneous coeval synchronous simultaneous coincident mean existing or occurring at the same time. contemporary is likely to apply to people and what relates to them. contemporaneous is more often applied to events than to people.

noun

  1. an electric motor having a speed strictly proportional to the frequency of the operating current