grammaticalness en · NOUN
Etymology
Etymology tree English grammatical Proto-Germanic *-inōną Proto-Indo-European *-dyé- Proto-Germanic *-atjaną Proto-Indo-European *-tus Proto-Germanic *-þuz Proto-Germanic *-assuz Proto-Germanic *-inassuz Proto-West Germanic *-nassī Old English -nes Middle English -nesse English -ness English grammaticalness From grammatical + -ness.
Meanings
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(of language, uncountable) Synonym of grammaticality.
There appear to be at least two distinct ways to assign levels of grammaticalness to deviant sentences.
1967, Lawrence E. Marks, “Judgments of Grammaticalness of Some English Sentences and Semi-Sentences”, in The American Journal of Psychology, volume 80, number 2, page 196: