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.
Origin
1960s. From mental + -ese.
Definition of mentalese in US English:
mentalese
nounˌmɛnt(ə)lˈiːz
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.