(US, informal) To base on.

simple past tense and past participle of BASE jump

plural of BASE jump

Third-person singular simple present indicative form of BASE jump

plural of base hit

plural of on-base percentage

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