SIMULTANEOUS
coincident, coincidental, coinciding, concurrent, co-occurrent, cooccurring, simultaneous
(adjective) occurring or operating at the same time; “a series of coincident events”
Source: WordNet® 3.1
Etymology
Adjective
simultaneous (not comparable)
Happening at the same moment.
(mathematics, of a set of equations) To be solved for the same values of variables.
Antonyms
• (happening at the same moment): sequential
Source: Wiktionary
Si`mul*ta"ne*ous, a. Etym: [LL. simultim at the same time, fr. L.
simul. See Simulate.]
Definition: Existing, happening, or done, at the same time; as,
simultaneous events.
– Si`mul*ta"ne*ous*ly, adv.
– Si`mul*ta"ne*ous*ness, n. Simultaneous equations (Alg.), two or
more equations in which the values of the unknown quantities entering
them are the same at the same time in both or in all.
Source: Webster’s Unabridged Dictionary 1913 Edition