-synchronic: Linguistics. [tr. F. synchronique (F. de Saussure a 1913, in Cours de linguistique générale (1916) iii. 117).] Pertaining to or designating a method of linguistic study concerned with the state of a language at one time, past or present; descriptive, as opposed to historical or diachronic. Also transf. in Anthropology, etc.
-diachronic: Linguistics.
[tr. F. diachronique (F. de Saussure a
1913, in
Cours de linguistique générale (1916) iii. 120).]
Pertaining to
or designating a method of linguistic study concerned with the
historical
development of a language; historical, as opposed to descriptive or
synchronic.
Also transf., in Anthropology, etc. Hence
chronically
achrony
* This information has been taken from OED