1. To be beneficial to one. My mom being away when report cards were mailed home has really been in my favor—I'm not grounded for my bad grades yet!

2. To be highly regarded by one; to be widely accepted or enjoyed by one. John had been in his boss's favor ever since he managed to secure that lucrative client. When we were making this sequel, we wanted to do right by the fans, so we're very pleased that it is in their favor.