1. Any shot in which the cue ball is caromed off an object ball to strike another object ball (with or without contacting cushions in the interim).
2. In certain carombilliards games such as three-cushion, a successful attempt at making a scoring billiardshot under the rules for that game (such as contacting three cushions with the cue ball while executing the billiard). A failed attempt at scoring would, in this context, not be called "a billiard" by players of such games even if it satisfied the first, more general definition.