asynchronous vs synchronous

asynchronous and synchronous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
asynchronous	No	Yes	No	No
synchronous	No	Yes	No	No

asynchronous (adjective)	synchronous (adjective)
not synchronous; not occurring or existing at the same time or having the same period or phase	occurring or existing at the same time or having the same period or phase
(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	(digital communication) pertaining to a transmission technique that requires a common clock signal (a timing reference) between the communicating devices in order to coordinate their transmissions