plural pens
1
: a place on a baseball field where pitchers practice throwing the ball before they start pitching in a game
A relief pitcher is warming up in the bullpen.
2
: the pitchers on a baseball team who can replace another pitcher during a game
The team has a strong bullpen.
Cite this Entry
“Bullpen.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/bullpen. Accessed 16 Apr. 2026.
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