History of linguistics (20th century) ; Erkenntnistheorie; Epistemology; Science (theory of) ; Philosophy of science ; Community language; Netzwerk (Soziolinguistik) ; Network (sociolinguistics) ; Speech community ; Einfluss von Sprachen aufeinander; Sprachberührung; Areallinguistik; Languages in contact ; Transfer (languages in contact) ; Adstratum language; Adstratsprache; Interference ; Diachrony/Synchrony