mentalesen.
/ˌmɛnt(ə)lˈiːz/, U.S. /ˌmɛn(t)lˈiz/ Philosophy.
A universal non-verbal system of concepts, etc., conceived of as an innate representational system resembling language, which is the medium of thought and underlies the ability to learn and use a language.
ΚΠ
1964 W. Sellars in Jrnl. Philos. 61 657 The concept of a proposition as something that can be expressed by sentences in both Mentalese and, say, English is an analogical extension of the concept of a proposition as something that can be expressed by sentences in both English and German.
1977 Mind 86 267 We aren't born with an inner code word for ‘airplane’ but if we couldn't form at the outset a predicate of inner mentalese at least coextensive with ‘airplane’ we could never learn what ‘airplane’ meant.
1995 Nature 19 Jan. 205/1 What..gives mentalese its content (its ‘semantics’)—how do mental symbols stand for a proposition about the world that is true or false?
This is a new entry (OED Third Edition, September 2001; most recently modified version published online March 2022).
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n.1964