Definitions

1. verb

to play a musical instrument or sing, especially in a professional capacity

“The concert pianist will playball with the orchestra tonight.”

2. verb

to engage in a sport or activity, especially baseball, in a competitive manner

“The players will playball at 3 PM on Saturday.”

3. interjection

an expression used to encourage or signal the start of a game or activity, especially baseball

“Playball!”

4. noun

the ball in a game of baseball, especially when thrown by the pitcher

“The umpire called the playball foul.”