Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

simultaneous

play
adjective si·mul·ta·neous \ˌsī-məl-ˈtā-nē-əs, -nyəs also ˌsi-\

Simple Definition of simultaneous

  • : happening at the same time

Source: Merriam-Webster's Learner's Dictionary

Full Definition of simultaneous

  1. 1 :  existing or occurring at the same time :  exactly coincident

  2. 2 :  satisfied by the same values of the variables <simultaneous equations>

simultaneity

\-tə-ˈnē-ə-tē, -ˈnā-\ noun

simultaneously

play \-ˈtā-nē-əs-lē, -nyəs-\ adverb

simultaneousness

noun

Examples of simultaneous in a sentence

  1. The two gunshots were simultaneous.

  2. <a simultaneous release of the movie and its soundtrack on CD>



Origin and Etymology of simultaneous

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


First Known Use: circa 1660

Synonym Discussion of 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>.

Rhymes with simultaneous


SIMULTANEOUS Defined for Kids

simultaneous

play
adjective si·mul·ta·neous \ˌsī-məl-ˈtā-nē-əs\

Definition of simultaneous for Students

  1. :  existing or taking place at the same time <simultaneous events>

simultaneously

adverb




Seen and Heard

What made you want to look up simultaneous? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to proceed clumsily or ineffectually

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

lavender-fields-in-france

Which of these is a synonym of caesura?

rebellion interruption megillah torrent
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ