Meaning : Occurring or existing at the same time or having the same period or phase.
Example :
Recovery was synchronous with therapy.
A synchronous set of clocks.
The synchronous action of a bird's wings in flight.
Synchronous oscillations.
Synonyms : synchronal, synchronous
Not synchronous. Not occurring or existing at the same time or having the same period or phase.
asynchronousMeaning : Concerned with phenomena (especially language) at a particular period without considering historical antecedents.
Example :
Synchronic linguistics.
Used of the study of a phenomenon (especially language) as it changes through time.
Diachronic linguistics.Meaning : (of taxa) occurring in the same period of geological time.