Final answer:
The distance between what represents the shortest diameter of the pelvic outlet is defined by the inferior limit of the lesser pelvic cavity.
Step-by-step explanation:
The shortest diameter of the pelvic outlet is defined by the inferior limit of the lesser pelvic cavity. The pelvic outlet is the inferior opening of the pelvis and is formed by the inferior margin of the pubic symphysis, the ischiopubic rami and sacrotuberous ligaments, and the tip of the coccyx. The distance between these structures represents the shortest diameter of the pelvic outlet.