synchronic

English Wikipedia has an article on:

diachrony and synchrony

Wikipedia

By surface analysis, syn- +‎ chron- +‎ -ic; historically, see synchronous § Etymology.

• (US, Canada) IPA^(key): /sɪŋˈkɹɑnɪk/
• (UK) IPA^(key): /sɪŋˈkɹɒnɪk/, /sɪnˈkɹɒnɪk/

synchronic (not comparable)

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

   • 2012, James Lambert, “Beyond Hobson-Jobson: A new lexicography for Indian English”, in World Englishes‎^[1], page 300:

     The three texts that contain a more modern selection of lexis, Sengupta, Nihalani et al, and Mahal, being entirely synchronic, also suffer from a lack of historical perspective.

• (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.

• asynchronic
• synchronically
• synchronicity

• synchronous
• synchronical