a spherical or approximately spherical body or shape; sphere: He rolled the piece of paper into a ball.

a round or roundish body, of various sizes and materials, either hollow or solid, for use in games, as baseball, football, tennis, or golf.

a game played with a ball, especially baseball: The boys are out playing ball.

Baseball. a pitched ball, not swung at by the batter, that does not pass over home plate between the batter's shoulders and knees.

Military. a solid, usually spherical projectile for a cannon, rifle, pistol, etc., as distinguished from a shell. projectiles, especially bullets, collectively.