proto-diasystemn.
/ˌprəʊtə(ʊ)ˈdʌɪəsɪstᵻm/, U.S. /ˌproʊdoʊˈdaɪəsɪstəm/ Linguistics. Now rare.
A hypothetical reconstruction of the system of linguistic relationships in a proto-language.
ΘΚΠ
the mind > language > a language > [noun] > family of languages > antecedent or parent language > analysis of
proto-diasystem1964
1964 Word 20 376 If I use the term proto-language for a reconstruction and proto-dialect for the real speech, my implication is that the reconstruction is in fact a proto-diasystem.
1968 Language 44 485 Proto-languages are to be understood as proto-dia-systems, with over-all sets of correspondences between related linguistic structures.
1972 Computers & Humanities 7 6 A corpus of about 1000 words, chosen from eleven villages, provided a concordance to suggest a reconstruction of the Franco-Provençal proto-diasystem and a tentative phonology.
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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n.1964