si·mul·ta·ne·ous (s  m l-t  n -s, s ml-)adj. 1. Happening, existing, or done at the same time. See Synonyms at contemporary. 2. Mathematics Containing variables for which there are values that can satisfy all the equations: simultaneous equations. [Latin simul, at the same time; see sem-1 in Indo-European roots + English -taneous (as in instantaneous).] si mul·tane·ous·ly adv.si mul·tane·ous·ness, simul·ta·nei·ty (-t-n-t, -n-) n. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | simultaneousness - happening or existing or done at the same time timing - the time when something happens conjunction, co-occurrence, coincidence, concurrence - the temporal property of two things happening at the same time; "the interval determining the coincidence gate is adjustable" |
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