asynchronous
adjective
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
Similar word(s): allochronic, anachronic, anachronistic, anachronous, nonsynchronous, unsynchronised, unsynchronized, unsynchronous, nonparallel, serial