Synonyms of simultaneous

simultaneous

adjective

ˌsī-məl-ˈtā-nē-əs 

as in concurrent

existing or occurring at the same period of time

a simultaneous release of the movie and its soundtrack on CD

Synonyms & Similar Words

• concurrent
• synchronous
• synchronic
• coincident
• coincidental
• contemporaneous
• contemporary
• coeval
• accompanying
• concomitant
• coextensive
• coterminous
• coetaneous
• coexistent
• incident
• coexisting
• attending
• attendant

Antonyms & Near Antonyms

• asynchronous
• nonsimultaneous
• nonsynchronous
• noncontemporary

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

Recent Examples of simultaneous

Last year, the Florida Department of Environmental Protection gave Floridians less than a week’s time to review the park development plans before a series of simultaneous meetings were to be held across the state. —Max Chesnes, Miami Herald, 23 May 2025

Ed Sheeran Superfan Events & Atlantic Records To mark the 10th anniversary of Ed Sheeran’s X album, Atlantic Records partnered with superfans via Fave to execute nine simultaneous events in cities like Paris, Manila, Rio, and Munich. —Kristin Westcott Grant, Forbes.com, 22 May 2025

The growing ability to sequence the human genome and compare thousands of genomes to each other now yields endless complexity and simultaneous opportunity for discovery. —Paul Sisson, San Diego Union-Tribune, 22 May 2025

The logistics of whole neighborhoods undertaking simultaneous construction projects on hillside streets, with only a few major arteries in and out, will test the recovery framework that EMD and Hagerty have been working to erect. —Matt Hamilton, Los Angeles Times, 18 May 2025