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 (sī′məl-tā′nē-əs, sĭm′əl-)
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- in Indo-European roots + English -taneous (as in instantaneous).]

si′mul·ta′ne·ous·ly adv.
si′mul·ta′ne·ous·ness, si′mul·ta·ne′i·ty (-tə-nē′ĭ-tē, -nā′-) n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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"
References in classic literature ?
It is worse; for you cannot sit motionless in the heart of these perils, because the boat is rocking like a cradle, and you are pitched one way and the other, without the slightest warning; and only by a certain self-adjusting buoyancy and simultaneousness of volition and action, can you escape being made a Mazeppa of, and run away with where the all-seeing sun himself could never pierce you out.
Yueyue pointed to the simultaneousness of the 40th victory anniversary of the Islamic Revolution with the 40th anniversary of reforms in the People's Republic of China and stated, "China is ready to boost and develop its relationship with the Islamic Republic of Iran in every field."
Elizabeth Bowen called Virginia Woolf "a master of the dramatic Now" namely because of Woolf's use of "that extraordinary simultaneousness in which a number of things may be made dramatic by happening close to each other" (135-36).
The words clearness and clear are used in such contexts that they signify, in opposition to simultaneousness or distinctness, a sort of confusion or heterogeneity of parts.
Wallace (2010) considered the non coherent reaches of secret key simultaneousness with open exchange over free indistinctly passed on Rayleigh obscuring remote channels, where neither the sender nor the recipients have section to quick channel state information (CSI).
The third and fourth courses arrived at the same time, so without referring back to the menu card I wasnt really sure which was third and fourth; the simultaneousness also managed to completely undermine the entire concept of a degustation.
The transformation was a 'complete transformation, parallel in all spheres' (72) which is also known as the 'dilemma of simultaneousness'.
These hauntings from film history, as well as those from pre-national Thailand, are combined in a postmodern stance that plays with a simultaneousness of various ages, in order to question the state of the nation, and of image-making, in the present day.