Real Dictionary

P.E.N. in American English
International Association of Poets, Playwrights, Editors, Essayists, and Novelists

pen
If people or animals are penned somewhere or are penned up, they are forced to remain in a very small area.
People sometimes say the pen to refer to a prison.
countable noun: A pen is a long thin object which you use to write in ink.
countable noun: A pen is also a small area with a fence round it in which farm animals are kept for a short time.
verb: If someone pens a letter, article, or book, they write it.

PEN in American English
International Association of Poets, Playwrights, Editors, Essayists, and Novelists
peninsula

pen in American English 1
a small yard or enclosure for domestic animals
to confine or enclose in or as in a pen
noun: any of various instruments for writing or drawing with ink or a similar substance
transitive verb: to write with or as with a pen; put down in writing

pen in American English 2
a heavy quill or feather trimmed to a split point, used for writing with ink
noun: a small enclosure for domestic animals
transitive verb: to confine in or as in a pen

pen in American English 3
a penitentiary
noun

pen in American English 4
noun: a female swan

PEN in British English
noun acronym for: International Association of Poets, Playwrights, Editors, Essayists, and Novelists

pen in British English 1
noun: an implement for writing or drawing using ink, formerly consisting of a sharpened and split quill, and now of a metal nib attached to a holder
verb: to write or compose

pen in British English 2
noun: an enclosure in which domestic animals are kept
verb: to enclose or keep in a pen

pen in British English 3
noun

pen in British English 4
noun: a female swan

pen in British English 5
noun

pen- in American English
combining form

Pen. in American English
peninsula

Pen. in British English
abbreviation for: Peninsula