panchronic
/ˌpanˈkrɒnɪk/Linguistics
adjective
Designating or relating to a linguistic structure or theory that may be applied to all languages at all stages of their development.
Origin
1930s; earliest use found in American Journal of Philology. From pan- + chronic, after French panchronique (F. de Saussure 1913 in this sense, in Cours de Linguistique générale i. iii. 138; earlier in sense (of species) showing no notable variation in their biological structure across geological timespans).