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On the other hand, there is a gradual abandonment of grammaticality in favour of acceptability by linguists that stress the social acquisition of language in contrast to innate factors (and who will seldom rely on phrase structure grammar) in the tradition of Hopper 1987. — “Grammaticality - Wikipedia, the free encyclopedia”, en.wikipedia.org
One doesn't have to believe in intuition being the only source of grammaticality judgement to be a generativist; there are certainly generativists who are very empirically inclined. Chomsky denied the existence of grammaticality as a basis for generative linguistics in ". — “Talk:Grammaticality - Wikipedia, the free encyclopedia”, en.wikipedia.org
In linguistics, grammaticalisation (also known as grammatisation, grammaticisation) is a process by which words representing objects and actions (ie. nouns and verbs) transform through sound change and language migration to become grammatical objects (affixes and prepositions, etc). — “Grammaticalisation - Wikipedia, the free encyclopedia”, en.wikipedia.org