ἑαυτοῦ/heautoū

This word is used instead of the name of a person or thing. It is a pronoun.

This word can mean himself, herself, or itself. This word is used in this way to talk about the person or thing in the sentence who is speaking or doing something. When this word is used to talk about more than one person, this word can mean themselves, ourselves, or yourselves.
This word can mean each other or one another. This word is used in this way to talk about people doing something for each other or with one another.
This word can mean his, her, or their. This word is used in this way to talk about something that belongs to the person or people who are doing something or were mentioned in the sentence.