interferenza grammaticale | interférence grammaticale | grammatische Interferenz
One or more contact-induced changes that affect the structural layers of one or more languages. Contrary to sporadic lexical interference, it involves intensive contact between speaker populations, usually for an extended period of time (for a fine-grained analysis of the types of scenarios in which this kind of interference occurs in the modern world, cf. Thomason 2006).
S. Thomason, 2006. Language Change and Language Contact, in Encyclopedia of Language & Linguistics, Elsevier, pp.339-347 DOI: 10.1016/B0-08-044854-2/01901-5.