simultaneous [sahy-m uhl- tey-nee- uhs, sim- uhl-] SYNONYMS | WORD ORIGIN adjective existing, occurring, or operating at the same time; concurrent: simultaneous movements; simultaneous translation. Related forms si·mul·ta·ne·ous·ly, adverb si·mul·ta·ne·ous·ness, si·mul·ta·ne·i·ty , [sahy-m uhl-t uh- nee-i-tee, sim- uhl-] /ˌsaɪ məl təˈni ɪ ti, ˌsɪm əl-/ noun non·si·mul·ta·ne·ous, adjective non·si·mul·ta·ne·ous·ly, adverb un·si·mul·ta·ne·ous, adjective un·si·mul·ta·ne·ous·ly, adverb un·si·mul·ta·ne·ous·ness, noun Synonyms for simultaneous
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for nonsimultaneous 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 board Sometimes shortened to: simul Derived Forms simultaneously, adverb simultaneousness 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
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Word Origin and History for nonsimultaneous 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.
Online Etymology Dictionary, © 2010 Douglas Harper