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Simultaneous derives its name from the word latin simul ('set'). Simultaneous things are those that occur or that are developing at the same time.
Examples: «the Minister's speech and the resignation of the Chancellor were simultaneous, which fuels the suspicions of a preliminary discussion between the two, 'the two matches will be played simultaneously in order to benefit any of the teams', 'TF1 will forward all shows simultaneously because the chain has multiple cameras on the premises.
The quality of what is simultaneous is concurrency. It is the property of two or more events that take place at the same time and, therefore, coincident in time (in a given reference frame).
The concept has applications in most areas. In economics, told a service meets the concurrency because its production and consumption occur simultaneously. This means that a service may not be stored for later consumption, unlike a product.
For historiography, simultaneous is synonymous with synchronic (with coincidence in time). Concurrency, synchronization, consistency, and coexistence, therefore, are similar concepts.
In the field of communication, concurrency concerns the possibility of immediate interaction or feedback. Simultaneous communication involves the transmitter to convey his message and that the receiver receives live without movement while being able to respond at the same time. Thus, the interaction occurs through the simultaneous exchange information.