synchronic

Synchronous.

Of or relating to the study of phenomena, such as linguistic features, or of events of a particular time, without reference to their historical context.

Same as synchronical.

occurring at a specific point in time.

relating to the study of a language at only one point in its history.

concerned with phenomena (especially language) at a particular period without considering historical antecedents

occurring or existing at the same time or having the same period or phase

(of taxa) occurring in the same period of geological time