Adjective
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(of taxa) occurring in the same period of geological time
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concerned with phenomena (especially language) at a particular period without considering historical antecedents
"synchronic linguistics"
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occurring or existing at the same time or having the same period or phase
"recovery was synchronous with therapy"- Jour.A.M.A.
"a synchronous set of clocks"
"the synchronous action of a bird's wings in flight"
"synchronous oscillations"