si·​mul·​ta·​neous | \ ˌsī-məl-ˈtā-nē-əs How to pronounce simultaneous (audio) , -nyəs also ˌsi- \

Definition of simultaneous

1 : existing or occurring at the same time : exactly coincident
2 : satisfied by the same values of the variables simultaneous equations

Keep scrolling for more

Other Words from simultaneous

simultaneity \ ˌsī-​məl-​tə-​ˈnē-​ə-​tē , -​ˈnā-​ also  ˌsi-​ \ noun
simultaneously \ ˌsī-​məl-​ˈtā-​nē-​əs-​lē How to pronounce simultaneous (audio) , -​nyəs-​ also  ˌsi-​ \ adverb
simultaneousness noun

Choose the Right Synonym for simultaneous

contemporary, contemporaneous, coeval, synchronous, simultaneous, coincident mean existing or occurring at the same time. contemporary is likely to apply to people and what relates to them. Abraham Lincoln was contemporary with Charles Darwin contemporaneous is more often applied to events than to people. contemporaneous accounts of the kidnapping coeval refers usually to periods, ages, eras, eons. two stars thought to be coeval synchronous implies exact correspondence in time and especially in periodic intervals. synchronous timepieces simultaneous implies correspondence in a moment of time. the two shots were simultaneous 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

Examples of simultaneous in a Sentence

The two gunshots were simultaneous. a simultaneous release of the movie and its soundtrack on CD
Recent Examples on the Web Latogg Dashawn Williams, 27, was arrested on charges of simultaneous possession of drugs and firearms, proximity to certain facilities, possession of cocaine with purpose, possession of MDMA with purpose and possession of xanax with purpose. Ashton Eley, Arkansas Online, 26 July 2021 As the nation rushed to put a man on the moon during the original U.S.-Soviet space race in the '60s, Black Americans were still fighting for equal freedoms back on Earth with the simultaneous eruption of the civil rights movement. Catherine Thorbecke, ABC News, 25 July 2021 Rod Mauldin said city police and the sheriff’s office received simultaneous calls at 3:49 p.m. reporting a domestic disturbance at the apartment complex on Carson Road. Carol Robinson |, al, 23 July 2021 While promoting the 2014 P&G Gymnastics Championships, Douglas helped set a Guinness World Record in Pittsburgh for the most simultaneous cartwheels alongside local gymnasts. Emily Leiker, USA TODAY, 22 July 2021 But on Twitch alone, the Game Awards tallied 2.63 million simultaneous viewers. Los Angeles Times, 21 Dec. 2020 Come fall, the Chula Vista plans to make available simultaneous live streams and recordings of the council meetings in Spanish, followed by Spanish closed captions on council meeting videos, said Cristina Hernandez, a Chula Vista city clerk analyst. San Diego Union-Tribune, 27 June 2021 But then a simultaneous attack on the extraction team all over the country ends in a lot of death; Kelly doesn’t escape without great loss himself. Bill Goodykoontz, The Arizona Republic, 28 Apr. 2021 First, said her organization is not coordinating with any of the other groups planning simultaneous events. Christal Hayes, USA TODAY, 14 Nov. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'simultaneous.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of simultaneous

circa 1660, in the meaning defined at sense 1

History and Etymology for simultaneous

Latin simul at the same time + English -taneous (as in instantaneous) — more at same

Keep scrolling for more

Learn More About simultaneous

Time Traveler for simultaneous

Time Traveler

The first known use of simultaneous was circa 1660

See more words from the same year

Dictionary Entries Near simultaneous



simultaneous contrast

See More Nearby Entries 

Statistics for simultaneous

Last Updated

28 Jul 2021

Cite this Entry

“Simultaneous.” Dictionary, Merriam-Webster, Accessed 31 Jul. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for simultaneous



English Language Learners Definition of simultaneous

: happening at the same time


si·​mul·​ta·​neous | \ ˌsī-məl-ˈtā-nē-əs How to pronounce simultaneous (audio) \

Kids Definition of simultaneous

: existing or taking place at the same time simultaneous events

Other Words from simultaneous

simultaneously adverb

More from Merriam-Webster on simultaneous

Nglish: Translation of simultaneous for Spanish Speakers

Britannica English: Translation of simultaneous for Arabic Speakers


Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
Spell It

Can you spell these 10 commonly misspelled words?

 AlphaBear 2

Spell words. Make bears.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!