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

Ten simultaneous connections cover Windows, macOS, Android, iOS, and Google Chrome, so phones, laptops, and tablets stay protected under one account. — Stackcommerce Team, PC Magazine, 12 Oct. 2026

Bond market turmoil and the simultaneous mass student protests at French schools are not a coincidence and point to the generational tradeoffs made in government spending, according to Nobel laureate Paul Krugman. — Jason Ma, Fortune, 10 Oct. 2026

This simultaneous rise of the Greens and Reform could fracture Britain’s political landscape, in which the first-past-the-post electoral system typically favors two or three major parties. — Issy Ronald, CNN Money, 7 Oct. 2026

So the idea was having Bernadette really be the mastermind of John’s upbringing as a way to provide a simultaneous salve for her husband’s shame about being afraid about losing out on the opportunity. — Tracy Brown, Los Angeles Times, 5 Oct. 2026