simultaneous

[sahy-muhl-tey-nee-uhs, sim-uhl-]

See more synonyms for simultaneous on Thesaurus.com

adjective

existing, occurring, or operating at the same time; concurrent: simultaneous movements; simultaneous translation.

Origin of simultaneous

1650–60; < Latin simul together (see similar) + (instan)taneous

Related formssi·mul·ta·ne·ous·ly, adverbsi·mul·ta·ne·ous·ness, si·mul·ta·ne·i·ty

[sahy-muhl-tuh-nee-i-tee, sim-uhl-] /ˌsaɪ məl təˈni ɪ ti, ˌsɪm əl-/, nounnon·si·mul·ta·ne·ous, adjectivenon·si·mul·ta·ne·ous·ly, adverbun·si·mul·ta·ne·ous, adjectiveun·si·mul·ta·ne·ous·ly, adverbun·si·mul·ta·ne·ous·ness, noun

Synonyms for simultaneous

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synchronous, coincident.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for simultaneity

unanimity, synchronism, synchroneity, simultaneity

Examples from the Web for simultaneity

Historical Examples of simultaneity

Twins they were in simultaneity of birth, but not in likeness of growth.
A Century of Science and Other Essays
John Fiske
We have not a direct intuition of simultaneity, nor of the equality of two durations.
Major Prophets of To-Day
Edwin E. Slosson
This simultaneity and concurrency are central tenets of imposing Shock and Awe.
Shock and Awe
Harlan K. Ullman
One may not appear twice in simultaneity upon the Time-scroll.
Astounding Stories, May, 1931
Various
He was interested by the celerity, the simultaneity of his impressions, his reflections.
Literature and Life
William Dean Howells

British Dictionary definitions for simultaneity

simultaneous

adjective

occurring, existing, or operating at the same time; concurrent

noun

chess a display in which one player plays a number of opponents at once, walking from board to boardSometimes shortened to: simul

Derived Formssimultaneously, adverbsimultaneousness or simultaneity (ˌsɪməltəˈniːɪtɪ, US ˌsaɪməltəˈniːɪtɪ), noun

Word Origin for simultaneous

C17: formed on the model of instantaneous from Latin simul at the same time, together

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for simultaneity

1650s, from simultaneous + -ity.

simultaneous

adj.

1650s, from Medieval Latin simultaneus, perhaps from simultim "at the same time," extended from Latin simul "at the same time" (see similar (adj.)), or from simul with ending abstracted from Late Latin spontaneus, where the -t- is organic. Related: Simultaneously.