baseball

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A game played with a bat and ball by two opposing teams of nine players, each team playing alternately in the field and at bat, the players at bat having to run a course of four bases laid out in a diamond pattern in order to score.
2. n. The ball that is used in this game.
3. n. A game of darts in which the players attempt to score points by throwing the darts at a target laid out in the form of baseball diamond.

Century Dictionary and Cyclopedia

1. n. A game of ball played by eighteen persons, nine on a side. A square plot of ground called the diamond, with sides 90 feet long, is marked off, at the corners of which are the bases, known as home or home base (B), first base (D), second base (E), and third base (F). The players on one side take their positions in the field, the catcher (A) just behind the home base, the pitcher (C) at a distance of 60 feet from the home base on the line from home to second base, the three basemen near first, second, and third base, the short-stop (G) between second and third, and three fielders, known as right (H), center (I), and left (J), at some distance behind and on each side of the second base. The pitcher pitches the ball over the home plate to the catcher. One of the other side, which is said to be in, or at the bat, takes a position by the home base, and tries to strike the ball as it passes him. If he knocks it into the air, and one of the other side catches it before it reaches the ground, the striker is out or caught out, that is, retires from the bat, and another takes his place. Should the ball pass outside the line from home to first or from home to third base continued indefinitely, it is a foul, and does not count at all, unless it is caught before it touches the ground, in which case the striker is out. Should it strike inside these lines, the batter runs to first base, and then or later to second, third, and home base. If he reaches home base he scores a run. Should the ball be thrown to and caught by a player standing on first base before the batter succeeds in reaching it, or should the batter be touched with the ball in the hands of any of his adversaries while running from one base to another, he is out. One player after another of the side which is “in” goes to the bat until three men have been put out. This constitutes an inning. Nine innings for each side make a game, and that side which succeeds in making the greater number of runs wins the game.
2. n. The ball with which this game is played.

Wiktionary

1. n. A sport common in North America, the Caribbean, and Japan, in which the object is to strike a ball so that one of a nine-person team can run counter-clockwise among four bases, resulting in the scoring of a run. The team with the most runs after termination of play, usually nine innings, wins.
2. n. The ball used to play the sport of baseball.
3. n. A variant of poker in which cards with baseball-related values have special significance.

GNU Webster's 1913

1. n. A game of ball, so called from the bases or bounds (four in number) which designate the circuit which each player must endeavor to make after striking the ball.
2. n. The ball used in this game.

WordNet 3.0

1. n. a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs
2. n. a ball used in playing baseball