Edge n. 1. A thin, sharpened side, as of the blade of a cutting instrument. 2. The degree of sharpness of a cutting blade. 3. A penetrating, incisive quality. 4. A slight but noticeable sharpness or harshness. 5. The line of intersection of two surfaces. 6. A rim or brink. 7. The point at which something is likely to begin. 8. The area or part away from the middle; an extremity. 9. A dividing line; a border.