REFLEXIVE›the reflexive form of the pronoun 'he': John always cuts himself when he's shaving.
EMPHASIZE›used to emphasize the pronoun 'he' or the particular male person you are referring to: Do you want to speak to Dr Randall himself or his secretary?He made the bookcase himself.
(all) by himself›alone or without anyone else's help: Joe made that snowman all by himself.
(all) to himself›for his use only: Tim wants a desk all to himself.