SYNCHRONOUS Synonyms: 22 Similar and Opposite Words

Q: How does the adjective 'synchronous' differ from other similar words?

Some common synonyms of synchronous are coeval , coincident , contemporaneous , contemporary , and simultaneous . While all these words mean "existing or occurring at the same time," synchronous implies exact correspondence in time and especially in periodic intervals. // synchronous timepieces

Q: When can 'coeval' be used instead of 'synchronous'?

The words coeval and synchronous are synonyms, but do differ in nuance. Specifically, coeval refers usually to periods, ages, eras, eons. // two stars thought to be coeval

Q: In what contexts can 'coincident' take the place of 'synchronous'?

The meanings of coincident and synchronous largely overlap; however, coincident is applied to events and may be used in order to avoid implication of causal relationship. // the end of World War II was coincident with a great vintage year

Q: When might 'contemporaneous' be a better fit than 'synchronous'?

In some situations, the words contemporaneous and synchronous are roughly equivalent. However, contemporaneous is more often applied to events than to people. // contemporaneous accounts of the kidnapping

Q: When is it sensible to use 'contemporary' instead of 'synchronous'?

The synonyms contemporary and synchronous are sometimes interchangeable, but contemporary is likely to apply to people and what relates to them. // Abraham Lincoln was contemporary with Charles Darwin

Q: Where would 'simultaneous' be a reasonable alternative to 'synchronous'?

Although the words simultaneous and synchronous have much in common, simultaneous implies correspondence in a moment of time. // the two shots were simultaneous

synchronous

adjective

ˈsiŋ-krə-nəs

Definition of synchronous

as in concurrent

existing or occurring at the same period of time the synchronous arrival of a baby sister and loss of a beloved grandmother strongly affected the child

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How does the adjective synchronous differ from other similar words?

Some common synonyms of synchronous are coeval, coincident, contemporaneous, contemporary, and simultaneous. While all these words mean "existing or occurring at the same time," synchronous implies exact correspondence in time and especially in periodic intervals.

synchronous timepieces

When can coeval be used instead of synchronous?

The words coeval and synchronous are synonyms, but do differ in nuance. Specifically, coeval refers usually to periods, ages, eras, eons.

two stars thought to be coeval

In what contexts can coincident take the place of synchronous?

The meanings of coincident and synchronous largely overlap; however, coincident is applied to events and may be used in order to avoid implication of causal relationship.

the end of World War II was coincident with a great vintage year

When might contemporaneous be a better fit than synchronous?

In some situations, the words contemporaneous and synchronous are roughly equivalent. However, contemporaneous is more often applied to events than to people.

contemporaneous accounts of the kidnapping

When is it sensible to use contemporary instead of synchronous?

The synonyms contemporary and synchronous are sometimes interchangeable, but contemporary is likely to apply to people and what relates to them.

Abraham Lincoln was contemporary with Charles Darwin

Where would simultaneous be a reasonable alternative to synchronous?

Although the words simultaneous and synchronous have much in common, simultaneous implies correspondence in a moment of time.

the two shots were simultaneous

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of synchronous Satellites operating in sun-synchronous orbit receive steady solar energy, providing a consistent power source without depending on Earth’s electrical grid. — Aamir Khollam, Interesting Engineering, 4 Aug. 2026 This 10,000-acre state park, an International Dark Sky Park, is considered one of the best places in West Virginia to see fireflies, including the synchronous type. — Evie Carrick, Travel + Leisure, 1 July 2026 And every spring, thousands of people throw their names into a lottery for a chance to witness synchronous fireflies in the Smokies. — Usa Today Network, USA Today, 10 June 2026 These collaborative activities across multiple trajectories can be both synchronous and asynchronous. — Carmen Daniela Maier, Encyclopedia Britannica, 26 May 2026 See All Example Sentences for synchronous

Recent Examples of Synonyms for synchronous

Adjective

The screenings run concurrent with the BBC Studios Showcase in London but no longer with MIP London, which is ending as MIP instead launches a London Book Fair event a few weeks later.

— Max Goldbart, Deadline, 15 Oct. 2026
Mackenzie Shirilla is serving two concurrent sentences of 15 years to life for killing her boyfriend, Dominic Russo, 20, and their friend, Davion Flanagan, 19, in a 2022 crash in Strongsville, Ohio, Fox News Digital previously reported.

— Stepheny Price, FOXNews.com, 13 Oct. 2026

Definition of concurrent

Adjective

Accelerating human evolution coincident with the development of agriculture increased redheadedness and decreased male-pattern baldness.

— Ann Manov, Harpers Magazine, 23 June 2026
In a separate announcement, but with coincident timing, WestJet also announced a stopover plan in Calgary.

— Don Tse, Forbes.com, 23 June 2026

Definition of coincident

Adjective

Following the simultaneous departures of former chiefs Owen Hunt (Kevin McKidd) and Teddy Altman (Kim Raver) at the end of last season, long-time fans might have expected another familiar face to take the helm.

— Max Gao, Variety, 16 Oct. 2026
Memoirs proceeds from there with that simultaneous posture of high-minded openness and a childish giggle.

— Jackson McHenry, Vulture, 16 Oct. 2026

Definition of simultaneous

Browse Nearby Words

synchronizing

synchronous

synchrony

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“Synchronous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/synchronous. Accessed 20 Oct. 2026.

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Synonyms of synchronous

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