naturalisation

/N AE1 CH ER0 AH0 L IH0 Z EY1 SH AH0 N/
noun
  1. 1

    The action of naturalizing somebody; act of granting citizenship.

  2. 2

    The admission or adoption of foreign words or customs into general use.

  3. 3

    The introduction and establishment of an animal or plant into a place where it is not indigenous.

Source: https://en.wiktionary.org/wiki/naturalisation, https://en.wiktionary.org/wiki/naturalization