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Wiktionary
naturalisation

n. (alternative spelling of naturalization English)

WordNet
naturalisation
  1. n. the quality of being brought into conformity with nature [syn: naturalization]

  2. the proceeding whereby a foreigner is granted citizenship [syn: naturalization]

  3. the introduction of animals or plants to places where they flourish but are not indigenous [syn: naturalization]

  4. changing the pronunciation of a borrowed word to agree with the borrowers' phonology; "the naturalization in English of many Italian words" [syn: naturalization]

Wikipedia
Naturalisation (biology)

In biology, naturalisation (or naturalization) is any process by which a non-native organism spreads into the wild and its reproduction is sufficient to maintain its population. Such populations are said to be naturalised.

Some populations do not sustain themselves reproductively, but exist because of continued influx from elsewhere. Such a non-sustaining population, or the individuals within it, are said to be adventive. Cultivated plants are a major source of adventive populations.

Naturalised species may become invasive species if they become sufficiently abundant to have an adverse effect on native plants and animals.

Usage examples of "naturalisation".

Sexual Selection -- On the generality of intercrosses between individuals of the same species -- Circumstances favourable and unfavourable to Natural Selection, namely, intercrossing, isolation, number of individuals -- Slow action -- Extinction caused by Natural Selection -- Divergence of Character, related to the diversity of inhabitants of any small area, and to naturalisation -- Action of Natural Selection, through Divergence of Character and Extinction, on the descendants from a common parent -- Explains the Grouping of all organic beings.

De Candolle has wall remarked in his great and admirable work, that floras gain by naturalisation, proportionally with the number of the native genera and species, far more in new genera than in new species.

No doubt some few anomalies occur in this great archipelago, and there is much difficulty in forming a judgment in some cases owing to the probable naturalisation of certain mammals through man's agency.