To be the author of (a published work or works)
To confine within a limited area
A place for the confinement of persons in lawful detention
An enclosed place
The means of enclosure
A writing instrument
"Think about the missing pen," he answered.
The pen has black ink in it now.
"It wasn't the only fountain pen in the world," Cynthia said.
Once the chickens were happy in their pen, she turned to Alex.
She found a pad and pen on his desk.