n (sports) One of the specified pre-determined segments of the total time of a sport event, such as a boxing or wrestling match, during which contestants compete before being signaled to stop.
n (sports) In some sports, e.g. golf or showjumping: one complete way around the course.
n (context|engineering|drafting|CAD) A rounded relief or cut at an edge, especially an outside edge, added for a finished appearance and to soften sharp edges.
n A strip of material with a circular face that covers an edge, gap, or crevice for decorative, sanitary, or security purposes.