To make natural
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 acclimatize an animal or plant.
To put into a new and improved form or condition; to restore to a former good state, or bring from bad to good; to change from worse to better
To form again or in a new configuration.
to reform a profligate man; to reform corrupt manners or morals; to reform a criminal
To return to a good state; to amend or correct one's own character or habits
The change of something that is defective, broken, inefficient or otherwise negative, in order to correct or improve it