Synchronic vs. Diachronic — What's the Difference?

Synchronous.

Of or concerned with phenomena, such as linguistic features, as they change through time.

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.

Occurring over or changing with time.

Occurring at a specific point in time.

Of, pertaining to or concerned with changes that occur over time.

(linguistics) Relating to the study of a language at only one point in its history.

Used of the study of a phenomenon (especially language) as it changes through time;

Occurring or existing at the same time or having the same period or phase;

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

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