asynchronous

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asynchronous

[ā′siŋ·krə·nəs]
(computer science)
Operating at a speed determined by the circuit functions rather than by timing signals.
(physics)
Not synchronous.

asynchronous

(architecture)
Not synchronised by a shared signal such as clock or semaphore, proceeding independently.

Opposite: synchronous.

1. <operating system> A process in a multitasking system whose execution can proceed independently, "in the background". Other processes may be started before the asynchronous process has finished.

2. <communications> A communications system in which data transmission may start at any time and is indicated by a start bit, e.g. EIA-232. A data byte (or other element defined by the protocol) ends with a stop bit. A continuous marking condition (identical to stop bits but not quantized in time), is then maintained until data resumes.

asynchronous

Events that are not synchronized or coordinated in time. All the following are asynchronous operations. The interval between transmitting A and B is not the same as between B and C. The ability to initiate a transmission at either end. Storing and forwarding messages. Starting the next operation before the current one is completed. Contrast with synchronous.
References in periodicals archive ?
The program starts with an unpaid four-week online session, administered asynchronously, so that prospective faculty--who come both from other universities as well as industry--can log on whenever they have the time, rather than at set hours.
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Changes in how the solution communicates asynchronously with legacy network elements, provisioning systems and enterprise middleware, reportedly enable service providers to rapidly introduce new services for a larger number of end users.
Many technical and business hurdles must be overcome to meet these requirements, primarily data replication, which can occur either synchronously or asynchronously.
Student interaction within a distance-learning environment typically occurs either synchronously or asynchronously.
Customers can enable SAP Remote Function Calls (RFCS) and Business Application Programming Interfaces (APIS) to receive XML requests and produce XML responses, permitting them to interact with internal and external systems in real-time or asynchronously.
Additionally, applications in need of credit reference checks are transmitted in real time to Tiresias, the Greek inter-bank credit reference authority and results are asynchronously added to the back office.

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