simultaneous [sahy-m uhl- tey-nee- uhs, sim- uhl-] Synonyms Word Origin 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
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for nonsimultaneous occurring, existing, or operating at the same time; concurrent 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
C17: formed on the model of
instantaneous from Latin simul at the same time, together
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for nonsimultaneous 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.
Online Etymology Dictionary, © 2010 Douglas Harper