Routledge Dictionary of Language and Linguistics
panchronic [Grk 
‘all, the whole,’ chrónos ‘time’]
Term used by de Saussure to indicate the approach to language which sees linguistic regularities in a language which are not subject to change through time. (
also universals)
References
Jakobson, R. 1968. Child language. Aphasia and phonological universals. The Hague.
Saussure, F.de.
1916. Cours de linguistique générale, ed. C.Bally and A.Sechehaye. Paris. (Course in general linguistics, trans. R.Harris. London, 1983.)
This is the complete article, containing 67 words
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