simultaneous
UK /ˌsɪm.əlˈteɪ̯.ni.əs/ · US /ˌsaɪ̯.məlˈteɪ̯.ni.əs/ adjective
- adjective Happening at the same moment.
- adjective (mathematics, of a set of equations) To be solved for the same values of variables.
Synonyms
coincident coincidental concomitant concurrent homochronous isochronous synchronal synchronical synchronous coinciding co-occurrent cooccurring
Antonyms
sequential asynchronous metachronous antisynchronous asynchronic heterochronous polychronic uncoincidental unconcurrent noncoincident noncoincidental nonconcurrent
Etymology
From Medieval Latin simultaneus, from simultim (“at the same time, extended”), from Latin simul (“together, at the same time”); compare similar.
Webster’s 1913
Etymology [LL. simultim at the same time, fr. L. simul. See Simulate.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “simultaneous”, CC BY-SA 4.0. Details