1. Baseball.a measure of the batting ability of a player, obtained by dividing the number of base hits by the number of official times at bat and carrying out the result to three decimal places. A player with 100 base hits in 300 times at bat has a batting average of 0.333.
2. Informal.a degree of achievement or accomplishment in any activity.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.