ball

noun

1. A solid or hollow sphere, or roughly spherical mass.
2. A quantity of string, thread, etc., wound into a spherical shape.
3. A food preparation formed into a spherical shape.
4. In 3-dimensional Euclidean space, the volume bounded by a sphere.
5. The set of points in a metric space of any number of dimensions lying within a given distance (the radius) of a given point.
6. The set of points in a topological space lying within some open set containing a given point.
7. A jacketed non-expanding bullet, typically of military origin.
8. Such bullets collectively.
9. A roundish, protuberant portion of some part of the body.
10. The front of the bottom of the foot, just behind the toes.
11. The globe; the earthly sphere.
12. An object that is the focus of many sports and games, in which it may be thrown, caught, kicked, bounced, rolled, chased, retrieved, hit with an instrument, spun, etc., usually roughly spherical or ovoid but whose size, weight, bounciness, colour, etc. differ according to the game
13. Any sport or game involving a ball; its play, literally or figuratively.
14. A pitch that falls outside of the strike zone.
15. An opportunity to launch the pinball into play.
16. A single delivery by the bowler, six of which make up an over.
17. a kick (or hit in e.g. field hockey) of the ball towards where one or more teammates is expected to be. (Distinguished from a pass by a longer distance travelled or less specific target point.)
18. An apparatus.
19. An apparatus program with a ball.
20. A testicle.