1. (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself;
2. not synchronous; not occurring or existing at the same time or having the same period or phase;
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3 definitions retrieved:
The Collaborative International Dictionary of English v.0.48:
Asynchronous \A*syn"chro*nous\, a. [Gr. ? not + synchronous.]
Not simultaneous; not concurrent in time; -- opposed to
Syn: nonsynchronous, unsynchronized, unsynchronous.
[Webster 1913 Suppl.]
2. (Paleontology) occurring in different geologic times; --
of taxa/ synchronous
[WordNet 1.5 +PJC]
3. chronologically misplaced; belonging to a different time
Syn: anachronic, anachronous, anachronistic
[WordNet 1.5 +PJC]
4. (Computers) occurring at different speeds in different
computers connected by a data transmission link; -- said
of methods data of transmission between computers.
Opposite of synchronous.
WordNet (r) 3.0 (2006):
adj 1: (digital communication) pertaining to a transmission
technique that does not require a common clock between
the communicating devices; timing signals are derived
from special characters in the data stream itself [ant:
2: not synchronous; not occurring or existing at the same time
or having the same period or phase [ant: synchronal,
The Free On-line Dictionary of Computing (18 March 2015):
Not synchronised by a shared signal such as
clock or semaphore, proceeding independently.
1. 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. 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.