1. The base that must be touched first by a base runner in baseball
   "The batter sprinted to first base after hitting a ground ball"
    
2. The fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate)
   "The coach moved his best defensive player to first base";
   - first
    
3. The initial stage in accomplishing something
   "we didn't get to first base with that approach"
    
4. [US, informal] Affectionate play (or foreplay without contact with the genital organs)
   "The teenagers only got to first base before her parents came home";
   - caressing, cuddling, fondling, hugging, kissing, necking, petting, snuggling

Type of: arousal, bag, base, first step, foreplay, initiative, opening, opening move, position, stimulation

Part of: baseball team

Encyclopedia: First base