Ball/bɔːl/ Definition 1 of 6Pro Tip 1/3Playful Context Used often when talking about children's activities and sports. The children played with a ball at the park. Pro Tip 2/3Sport-Specific Balls Different sports have uniquely designed balls, like a football or basketball. She dribbled the basketball skillfully. Pro Tip 3/3Figurative Expressions Phrases like 'on the ball' mean to be alert and efficient. Our team is on the ball with this project.