Rashi on Deuteronomy 24:2/רש"י על דברים כ״ד:ב׳

1לאיש אחר [AND WHEN SHE IS GONE OUT OF HIS HOUSE, AND HATH GONE AND BECOME] “ANOTHER” MAN’S WIFE — He is “another” (a different) man, not one of a pair with the first: he turned the wicked woman out of his house, whilst this man hath taken her into his house (Gittin 90b).