
1) Cultural assimilation
Found on
https://www.crosswordclues.com/clue/language-death

In linguistics, language death (also language extinction, linguistic extinction or linguicide, and rarely also glottophagy) is a process that affects speech communities where the level of linguistic competence that speakers possess of a given language variety is decreased, eventually resulting in no native or fluent speakers of the variety. Langua...
Found on
http://en.wikipedia.org/wiki/Language_death

The process by which a language ceases to exist. It is characterised by the switch over to some other language which surrounds the dying language and which is a superstratum to it, e.g. English vis à vis Manx on the Isle of Man in the middle of the present century.
Found on
https://www.uni-due.de/ELE/LinguisticGlossary.html
No exact match found.