To acclimatize an animal or plant.
To make (a word) a natural part of the language, using the native homologue of each phoneme (and often for each morpheme) of the imported word (e.g., native inflections).
To study nature.
To limit explanations of a phenomenon to naturalistic ones and exclude supernatural ones.
To grant citizenship to someone not born a citizen.
To make natural
To completely enclose or envelop.
To voraciously consume resources, such as money; to devour.
To take over or absorb something (especially an organisation) so it no longer has a separate identity; to assimilate.