(baseball) The frequency with which a hitter successfully reaches first base.

(rare) plural of first base

(rare) plural of second base

(rare) plural of third base

Someone who BASE jumps.

(baseball) An instance where the batter is allowed to go directly to first base without the possibility of being put out, due to the opposing pitcher delivering four balls.

(computing) The first 640 kilobytes of RAM on an IBM-compatible PC. / (computing) The amount of RAM installed on a new computer, before any optional upgrades.

plural of data base

(baseball) home plate / (business) headquarters

Based upon the concept of an object / (computing) encapsulating states and operations inside objects