Meaning of ITSELF in English

ITSELF

pron. emphatic and refl. form of IT(1). by itself apart from its surroundings, automatically, spontaneously. in itself viewed in its essential qualities (not in itself a bad thing).

[ OE f. IT(1) + SELF, but often treated as ITS + SELF (cf. its own self) ]

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.