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Proto-World
Proto-World n.
Brit. 
/ˈprəʊtəʊwəːld/
, /ˈprəʊtəʊwəːld/U.S. /ˈproʊdoʊˌwər(ə)ld/
Linguistics a proposed universal proto-language from which it is claimed all languages derive./ˈproʊdoʊˌwər(ə)ld/ΚΠ
1975 Papers 11th Regional Meeting Chicago Ling. Soc. 15 (title) Grammar-meaning universals and proto-language reconstruction; or, Proto-World now!
2003 F. J. Newmeyer in M. H. Christiansen Lang. Evol. iv. 63 Given the unidirectionality of grammaticalization changes, might one posit, then, that Proto-World had lexical categories, but no affixes or function words?
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