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Synonyms

simultaneity

American  
[sahy-muhl-tuh-nee-i-tee, sim-uhl-, -ney-] / ˌsaɪ məl təˈni ɪ ti, ˌsɪm əl-, -ˈneɪ- /
Sometimes simultaneousness

noun

  1. the state or quality of existing, occurring, or operating at the same time.

    The simultaneity of the two events was established by checking timestamps on recordings.


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

We’re reminded of porousness and simultaneity, and that all art histories are, in the end, propositional structures.

From Los Angeles Times • Apr. 22, 2026

For several years, he has been a persistent and often lonely voice calling for America to get serious about the simultaneity problem.

From The Wall Street Journal • Mar. 6, 2026

“This album is an exploration of the simultaneity of human emotions,” she wrote of last year’s “Fatigue,” “the audacity of joy in the wake of grief, disappointment in the face of accomplishment.”

From Washington Post • Sep. 28, 2022

He frequently shows events from different perspectives or illustrates simultaneity with split screens.

From New York Times • Sep. 24, 2020

Like the proof of the irrationality of V2, like the discussion of simultaneity in special relativity, this is an argument in which the premise is challenged because the conclusion seems absurd.

From "Cosmos" by Carl Sagan

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