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American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Baseball One of nine divisions or periods of a regulation game, in which each team has a turn at bat as limited by three outs.
2. n. Sports The division or period of a cricket game during which one team is at bat.
3. n. An opportunity to act or speak out; a chance for accomplishment. Often used in the plural with singular or plural verb.
4. n. The reclamation of flooded or marshy land.

Century Dictionary and Cyclopedia

1. n. A bringing or taking in; an ingathering, as of grain; a winning or gaining.
2. n. The time during which a person or party is in, or in action, in a game or an operation; a turn: usually (in Great Britain always) in the plural form, whether with a singular or a plural sense. Specifically— In cricket, base-ball, and similar games, as much of the game as is played while one side is at the bat (in this case often called a half-innings with respect to the next use), or while each side in turn is at the bat—that is, between the appearance of one side at the bat and its reappearance.
3. n. The term of office of a person; the time during which a party is in power; more generally, any opportunity for activity or influence: as, it is your innings now.
4. n. Land inclosed, when recovered from the sea.
5. n. The process of taking in; specifically, the reclaiming of marshy land by draining and banking and fitting it for bearing crops; also the land so reclaimed.
6. n. The act or process of getting in, as crops; harvesting.

Wiktionary

1. n. baseball A period of play in which members of a visiting baseball team attempt to hit a baseball pitched by the opposing home team until three players are called out, followed by a similar attempt by members of the home baseball team against the visiting team's pitching. There are nine or more innings in a regulation baseball game.
2. n. softball A similar period of play.
3. n. billiards A player (or team)'s turn at the table to make shots until ended by a miss or a foul.
4. n. A chance or opportunity to perform some deed or act.
5. n. obsolete Lands recovered from the sea.

GNU Webster's 1913

1. n. obsolete Ingathering; harvesting.
2. n. The state or turn of being in; specifically, in cricket, baseball, etc., each period during which both teams get one turn each at bat; -- often in the pl. The turn or time of a person, or a party, in power.
3. n. Lands recovered from the sea.

WordNet 3.0

1. n. (baseball) one of nine divisions of play during which each team has a turn at bat