English
internalist
From internal + -ist.
A compound of internal + -ist
Proto-Indo-European *h₁én ‘in’
…
Latin inter ‘between’
Latin internus ‘inward’
New Latin internālis ‘of or pertaining to the inner part’
Middle English internall
English internal
Today it means
adj Holding that a particular mental phenomenon, such as motivation or justification, has an internal rather than external basis
Language periods are conventional ranges, not dates for this word.
Etymograph / internalist