Synchronous (adjective)

1. Occurring or existing at the same time.
2. Operating in a manner such that the sequence of events is the same for all devices or systems involved.
3. Occurring in step with a set pattern or rhythm.

Origin:

Late 17th century: from french synchrone or modern latin synchronus, from greek sun- "together" + chronos "time".

Examples:

1. The synchronous dance was performed in perfect unison.
2. The synchronous operation of the machines was critical to the production process.
3. The synchronous footsteps of the marchers echoed through the street.
4. The synchronous rotation of the planets was a beautiful sight.
5. The synchronous music and lights created a mesmerizing show.