asynchronous

adjectives

(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
antonym
not synchronous; not occurring or existing at the same time or having the same period or phase
antonym
is similar to
(of taxa) occurring in different geologic times
is similar to
chronologically misplaced
"English public schools are anachronistic"
is similar to
not occurring together
is similar to
of or relating to the sequential performance of multiple operations
"serial processing"