WordNet

at the same instant; "they spoke simultaneously" (同)at the same time
(digital communication) pertaining to a transmission technique that requires a common clock signal (a timing reference) between the communicating devices in order to coordinate their transmissions
occurring or existing at the same time or having the same period or phase; "recovery was synchronous with therapy"- Jour.A.M.A.; "a synchronous set of clocks"; "the synchronous action of a birds wings in flight"; "synchronous oscillations" (同)synchronal, synchronic
matching point for point; "coincident circles"
occurring or operating at the same time; "a series of coincident events" (同)coincidental, coinciding, concurrent, co-occurrent, cooccurring, simultaneous
overlapping in duration; "concurrently with the conference an exhibition of things associated with Rutherford was held"; "going to school and holding a job at the same time" (同)at the same time
in synchrony; in a synchronous manner; "in four-chambered hearts, the two auricles move synchronously"

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同時に
(…と)同時に起こる(発生する)《+『with』+『名』》 / (線などが)同一点に集合する / (意見などが)一致した,同一の
同時に起こる / 調子を合わせて動く(進行する)
同時に起こる;(…と)同時に起こる《+『with』+『名』》 / 一致した,符合した;(…と)一致する《+『with』+『名』》
付随する,同時に起こる;(…に)伴う《+『with』(『to』)+『名』》 / (…に)付随する物,(…の)つきもの;《複数形で》(…に)付随する事情《+『of』(『to』)+『名』》
同時の;(…と)同時に起こる《+『with』+『名』》

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/02/12 20:24:23」(JST)

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Simultaneity is the property of two events happening at the same time in a frame of reference. According to Einstein's theory of relativity, simultaneity is not an absolute property between events; what is simultaneous in one frame of reference will not necessarily be simultaneous in another. (See Relativity of simultaneity.) For inertial frames moving at speeds small compared to the speed of light with respect to one another this effect is small and can for practical matters be ignored such that simultaneity can be treated as an absolute property.

The word derives from the Latin simul, at the same time (see sem-1 in Indo-European Roots) plus the suffix -taneous, abstracted from spontaneous^[1] (which in turn comes directly from Latin^[2]).

The noun simult means a supernatural coincidence, two or more divinely inspired events that occur at or near the same period of time that are related to each other in both noticeable and unnoticeable characteristics.^{[citation needed]}

In econometrics, it arises when one or more of the explanatory variables is jointly determined with the dependent variable, typically through an equilibrium mechanism.
In criminal law, for a criminal violation to be established, it usually must be shown that there was simultaneity of actus reus and mens rea.
In mathematics, a system of equations or a set of simultaneous equations share variables; a solution is a set of variable values for which all these equations are satisfied together.
In music, see Simultaneity (music).
In physics, see Relativity of simultaneity.
In marketing, simultaneity is one of the characteristics of a service which differentiates it from a product. It refers to the idea that the production and consumption of a service occur simultaneously, making it impossible to produce and store a service prior to consumption.
Simultaneous publishing is the publication of a work by two or more entities within a short duration, requiring both entities to hold non-exclusive rights to the work.
In computer science, see Concurrency (computer_science).

References

^ "etymology of simultaneous". Online Etymology Dictionary. Retrieved 2011-06-22.
^ "etymology of spontaneous". Online Etymology Dictionary. Retrieved 2011-06-22.

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Qing Z1, Zhu L2, Yang S2, Cao Z2, He X3, Wang K3, Yang R4.
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