asyn·chro·nous definition from Merriam Websterrs @ http://www.m-w.com/

Main Entry: asyn·chro·nous
Pronunciation: (")A-'si[ng]-kr&-n&s, -'sin-
Function: adjective
Date: 1748
1 : not synchronous
2 : of, used in, or being digital communication (as between computers) in which there is no timing requirement for transmission and in which the start of each character is individually signaled by the transmitting device
- asyn·chro·nous·ly adverb