Synonym Chooser

How does the adjective simultaneous differ from other similar words?

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

the two shots were simultaneous

When can coeval be used instead of simultaneous?

Although the words coeval and simultaneous have much in common, coeval refers usually to periods, ages, eras, eons.

two stars thought to be coeval

In what contexts can coincident take the place of simultaneous?

In some situations, the words coincident and simultaneous are roughly equivalent. 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 is it sensible to use contemporaneous instead of simultaneous?

The words contemporaneous and simultaneous are synonyms, but do differ in nuance. Specifically, contemporaneous is more often applied to events than to people.

contemporaneous accounts of the kidnapping

Where would contemporary be a reasonable alternative to simultaneous?

The meanings of contemporary and simultaneous largely overlap; however, contemporary is likely to apply to people and what relates to them.

Abraham Lincoln was contemporary with Charles Darwin

When might synchronous be a better fit than simultaneous?

The synonyms synchronous and simultaneous are sometimes interchangeable, but synchronous implies exact correspondence in time and especially in periodic intervals.

synchronous timepieces

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 simultaneous Pricing starts at $39 per month and includes unlimited bandwidth for up to 40 simultaneous connections for one computer. Kim Key, PC Magazine, 1 July 2025 But Quỳnh’s unexpected return to civilization and the simultaneous emergence of Uma Thurman’s mysterious figure known as Discord test Andy and her team in unprecedented ways. Brian Davids, HollywoodReporter, 1 July 2025 Bracy Davis is resigning in order to run in the simultaneous special Senate election for the seat formerly held by the late Geraldine Thompson, who died in February. Steven Lemongello, The Orlando Sentinel, 21 June 2025 That was the prevailing consternation emanating out of Queens and the Bronx last week as both the Yankees and the Mets engaged in simultaneous 13-day pratfalls that raised legitimate concerns as to just how good our locals really are. Bill Madden, New York Daily News, 28 June 2025 See All Example Sentences for simultaneous
Recent Examples of Synonyms for simultaneous
Adjective
  • Twitch streams of people playing Rematch surpassed 40,000 concurrent viewers Monday night with the help of popular European content creator eliasn97, who accounted for three-quarters of those spectators.
    Jacob Feldman, Sportico.com, 8 July 2025
  • He’s expected to receive a concurrent state prison sentence for violating the terms of that program.
    Muri Assunção, New York Daily News, 24 June 2025
Adjective
  • That’s highly synchronous, resulting in many, many animals making that migration simultaneously.
    Noël Fletcher, Forbes.com, 23 May 2025
  • The sheer number of DNA shifts that must have occurred in rapid succession to create this synchronous outcome also reflects the strong pressure horses were likely under to become fast and tireless.
    Lauren Leffer, Popular Science, 27 Mar. 2025
Adjective
  • With a lockable synchronic-tilt mechanism and special Z-Shape design, the Kaiser 2 can accommodate a weight up to 180kg, quite a bit more than normal mechanisms on office chairs and the back can be reclined to an angle of 160 degrees which can be locked when not in rocking mode.
    Mark Sparrow, Forbes, 11 Oct. 2021
  • For his last runway collection, unveiled in September, Michele constructed a parallel universe of side-by-side shows separated by a wall that when lifted revealed twins in identical looks in synchronic stride.
    Colleen Barry, Fortune, 24 Nov. 2022
Adjective
  • The timing of these changes were roughly coincident with clarification of Information Blocking rules and Epic’s introduction of its own competing product.
    Seth Joseph, Forbes, 26 Feb. 2024
  • Another suggestion is that there were two more or less coincident eruptions, one each in northern and southern hemispheres.
    Erik Klemetti, Discover Magazine, 26 July 2011

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Cite this Entry

“Simultaneous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/simultaneous. Accessed 19 Jul. 2025.

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