Ask at the forum if you have an Ancient or Modern Greek query!
P. and V. αὐτός.
By oneself: P. and V. αὐτὸς καθʼ αὑτόν.
Of itself: P. ἀπὸ ταὐτομάτου.
Come to oneself: V. ἐν αὑτῷ γίγνεσθαι; see recover.
Consider each point by itself: P. ἕκαστον ἐφʼ ἑαυτοῦ σκοπεῖν (Dem. 370).