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  • Adj.




Two synchronous developments were the invention of refrigeration and the completion of the railroad; because they happened at the same time, these two technologies were used together to great effect. The synchronous or simultaneous abilities of trains traveling across the country while their large refrigeration units kept food fresh changed the way people ate. Now a salad from California and green beans from Virginia could be eaten in synchronous fashion or at same time in New York City.

Quiz: What is an example of synchronous actions?

  • A goal in soccer that is scored just seconds after the game ends.
  • A car that drives over railroad tracks right before a train arrives.
  • The movements of two dancers that occur at the same time.

Memory Hook

Synced Synchronous events are synced so that they occur at the same time.


  • Strogatz explores dozens of strange synchronous phenomena, from hands clapping in unison to the rhythmic flashing of fireflies to laser beams produced by trillions of atoms emitting light waves in phase at the same frequency. —Discover Magazine
  • The other satellites, which are measuring water, clouds, aerosols and other characteristics of our planet, are "sun-synchronous" and fly over each part of the earth at the same hour. —Wired
  • The Chicxulub Crater, located in Mexico's Yucatan Peninsula, was impacted by an asteroid approximately 66,038,000 years ago, an event that was "synchronous to within a gnat's eyebrow" of when the dinosaurs went extinct, says the study's lead author Paul Renne, director of the University of California, Berkeley's Geochronology Center. —U.S. News & World Report
  • Shot in one take, it features all four members of the pop group performing synchronous moves—such as mimicking figure skating—on the gym equipment conveyor belts. —The Christian Science Monitor

Word Ingredients

syn- together, with
chron time
-ous possessing the nature of

Synchronous events occur “together in time.”

Word Theater

Greek: Agents of Change These young men jump at will and then jump synchronously ... but not for long.

Word Constellation