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Wiktionary
run batted in

n. (context baseball English) A run that a given player has caused to be scored by a hit, walk(,) or sacrifice.

WordNet
run batted in

n. a run that is the result of the batter's performance; "he had more than 100 rbi last season" [syn: rbi]

Wikipedia
Run batted in

Run batted in (plural runs batted in, abbreviated RBI) is a statistic in baseball and softball that credits a batter for making a play that allows a run to be scored (except in certain situations like when an error is made on the play).

Historically, the Buffalo Bisons were the first team to track RBIs. Major League Baseball did not recognize the RBI as an official statistic until 1920.

Common nicknames for an RBI include "ribby", "rib", and "ribeye". The plural of RBI is generally "RBIs", although some commentators use "RBI" as both singular and plural, as it can also stand for "runs batted in".