This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Occurring or existing at the same time. See Synonyms at contemporary.

adj. Moving or operating at the same rate.

adj. Having identical periods.

adj. Having identical period and phase.

adj. At the same time, at the same frequency.

adj. Single-threaded; blocking; occurring in the same thread as other computations, thereby preventing those computations from resuming until the communication is complete.

adj. Happening at the same time; simultaneous.

Happening at the same time; simultaneous.

In electricity, in step with the alternations of the current.

adj. occurring or existing at the same time or having the same period or phase

adj. (digital communication) pertaining to a transmission technique that requires a common clock signal (a timing reference) between the communicating devices in order to coordinate their transmissions

"Lots of times words get perverted, too -- computer scientists who talk of "synchronous processes" have no idea what the actual definition in English of "synchronous" is -- they think it means "synchronized" -- and when they call putting millions of transistors on a tiny chip and call it Very Large Scale Integration, they're turned the phrase "large scale" on its very head."

synchronic    cooccurring    parallel    coexistent    synchronized   

asynchronous   

synchronous converter    synchronous motor    synchronous curve    synchronous transmitter   

synchronic    synchronously    simultaneity    synchrony    synchronise   

simultaneous    contemporaneous    in synch    in step    in phase   

asynchronous    high-speed    point-to-point    concurrent    8-bit