Synchronic

1. Occurring at a specific point in time.

Antonym: diachronic

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

Antonym: diachronic

(linguistics, relating to the study of a language at only one point in its history): Synchronic comparison of two languages focuses on categorizing phenomena typologically, whereas a diachronic comparison may be looking for common origins or causes of these phenomena, viewed as genetic relationships.