'Simultaneous' definitions:

Definition of 'simultaneous'

From: WordNet
adjective
Occurring or operating at the same time; "a series of coincident events" [syn: coincident, coincidental, coinciding, concurrent, co-occurrent, cooccurring, simultaneous]

Definition of 'Simultaneous'

From: GCIDE
  • Simultaneous \Si`mul*ta"ne*ous\, a. [LL. simultim at the same time, fr. L. simul. See Simulate.] 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. [1913 Webster]
  • 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. [1913 Webster]