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• pen
  pen

  noun

  any of various instruments for writing or drawing with ink or a similar substance.
• pen-
  pen-

  variant of pene- before a vowel.
• Pen.
  Pen.

  abbreviation

  peninsula.
• P.E.N.
  P.E.N.

  abbreviation

  International Association of Poets, Playwrights, Editors, Essayists, and Novelists.
• PEN
  PEN

  acronym

  International Association of Poets, Playwrights, Editors, Essayists, and Novelists

pen

¹ American  

[pen] / pɛn /

noun

1. any of various instruments for writing or drawing with ink or a similar substance.

2. a detachable metal penpoint, filled by dipping or with a quill; nib.

3. such a penpoint with its penholder.

4. fountain pen.

5. ballpoint pen.

6. the pen as the instrument of writing or authorship.

   The pen is mightier than the sword.

7. a person's style or quality of writing.

   He writes with a witty, incisive pen.

8. a writer.

   I leave this story to abler pens.

9. the profession of writing.

   a master of the pen.

10. a pen-shaped device having a cartridge filled with a drug or medication.

    an insulin pen with disposable needles.

11. Computers. stylus.

12. Ornithology.

    1. a quill.

    2. a pinfeather.

13. something resembling or suggesting a feather or quill.

14. Zoology. an internal, corneous or chitinous, feather-shaped structure in certain cephalopods, as the squid.

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verb (used with object)

penned, penning

1. to write with or as with a pen; put down in writing.

   to pen an essay.

2. to draw with or as with a pen.

   to pen a sketch.

pen ² American  

[pen] / pɛn /

noun

1. a small enclosure for domestic animals.

2. animals so enclosed.

   We have a pen of twenty sheep.

3. an enclosure used for confinement or safekeeping.

   We have built several pens to hold our harvest of corn.

4. playpen.

5. bull pen.

6. a dock having a protective concrete structure overhead, used to service and repair submarines.

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verb (used with object)

penned, pent, penning

1. to confine in or as in a pen.

pen ³ American  

[pen] / pɛn /

noun

Slang.

1. penitentiary.

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pen ⁴ American  

[pen] / pɛn /

noun

1. a female swan.

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pen- ⁵ American  

1. variant of pene- before a vowel.

   penannular.

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Pen. ⁶ American  

Or pen.

abbreviation

1. peninsula.

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P.E.N. ⁷ American  

abbreviation

1. International Association of Poets, Playwrights, Editors, Essayists, and Novelists.

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pen ¹ British  

/ pɛn /

noun

1. 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 See also ballpoint fountain pen

2. the writing end of such an implement; nib

3. style of writing

4. 1. writing as an occupation

   2. the written word

      the pen is mightier than the sword

5. the long horny internal shell of a squid

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verb

1. (tr) to write or compose

pen ² British  

/ pɛn /

noun

1. an enclosure in which domestic animals are kept

   sheep pen

2. any place of confinement

3. a dock for servicing submarines, esp one having a bombproof roof

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verb

1. (tr) to enclose or keep in a pen

PEN ³ British  

/ pɛn /

acronym

1. International Association of Poets, Playwrights, Editors, Essayists, and Novelists

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Pen. ⁴ British  

abbreviation

1. Peninsula

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pen ⁵ British  

/ pɛn /

noun

1. informal short for penitentiary

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pen ⁶ British  

/ pɛn /

noun

1. a female swan

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pen Idioms  

1. see slip of the lip (pen).

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Other Word Forms

• penlike
  adjective
• penner
  noun

Etymology

Origin of pen¹

First recorded in 1250–1300; Middle English penn(e), from Old French penne “pen, feather,” from Late Latin penna “pen,” from Latin penna, pinna “feather, wing”

Origin of pen²

First recorded before 1000; (noun) Middle English penne, Old English penn (in compounds); perhaps akin to pin; (verb) Middle English pennen, derivative of the noun

Origin of pen³

An Americanism dating back to 1880–85; shortened form

Origin of pen⁴

First recorded in 1540–50; origin uncertain

Explanation

A pen is an ink-filled tool that you use for writing or drawing. Doing a crossword puzzle with a pen shows a lot of self confidence, since you can't erase your answers. Pen is also a verb meaning "to write," especially when you're writing something of literary value: "She's my favorite writer — I can't wait for her to pen another novel!" Then there's the pen that you keep your pet donkey safely inside (you can also say you pen him in there), and inspired by this "livestock enclosure" meaning there's also the slang for "penitentiary" or "jail."

Example Sentences

But one six-year-old boy - who regards himself as his "biggest fan" - has put pen to paper to mark the broadcaster's 100th birthday, by drawing 100 of his favourite animals.

From BBC • May 7, 2026

Katy administered an adrenaline pen and Molly was taken to hospital where she later recovered, but Katy said the fear had never left her.

From BBC • Apr. 23, 2026

The Montblanc Meisterstück fountain pen has been a favorite of leaders including King Charles and John F. Kennedy.

From The Wall Street Journal • Apr. 21, 2026

The resolution asks teachers to “encourage the use of paper and pen assignments” and also contemplates banning student access to YouTube as well as the gaming platforms Roblox and “Fortnite.”

From Los Angeles Times • Apr. 21, 2026

Akira rooted around in Nova’s desk for a pen and paper and quickly scribbled a note to Nova, apologizing for raiding her house and promising to pay her back for everything.

From "Two Degrees" by Alan Gratz

Related Words

• fountain pen
• marker
• stick