I.opp. to ἴδιος, of or belonging to another, Lat. alienus, Hom., etc.; ἀλλ. γυνή another man's wife, Aesch.; γναθμοῖσι γελοίων ἀλλοτρίοισιν, of the suitors, laughed with a face unlike one's own, of a forced, unnatural laugh, Od. (Horace's malis ridere alienis is different); ἀλλ. ὄμμασιν by the help of another's eyes, Soph.; ἀλλοτριωτάτοις τοῖς σώμασιν χρῆσθαι to deal with one's body as if it absolutely belonged to another, Thuc.
II.opp. to οἰκεῖος, foreign, strange, Lat. peregrinus, Hom.; often with the notion of hostile, Il.