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pen (n.1)

late 13c., penne, "writing implement made from the hard, hollow stem at the base of a feather," from Old French pene "quill pen; feather" (12c.) and directly from Latin penna "a feather, plume," in plural "a wing," in Late Latin, "a pen for writing," from Old Latin petna, pesna, from PIE *pet-na-, suffixed form of root *pet- "to rush; to fly."

In later French, this word means only "long feather of a bird," while the equivalent of English plume is used for "writing implement;" the senses of the two words in French thus are reversed from the situation in English.

In Middle English also "a feather," especially a large one from the wing or tail. The sense was extended to any instrument of similar form used for writing by means of fluid ink. Pen-and-ink (adj.) "made or done with a pen and ink" is attested from 1670s. Pen name "fictitious name assumed by an author" is by 1857 (French nom de plume was used in English from 1823). Southey uses pen-gossip (v.) "to gossip by correspondence" (1818).

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pen (n.2)

"small enclosure for domestic animals," Old English penn, penne, a word of uncertain origin, perhaps related to Old English pinn "pin, peg" (see pin (n.)) on the notion of a bolted gate or else "structure made of pointed stakes."

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pen (v.1)

"to write, compose and commit to paper," late 15c., from pen (n.1). Related: Penned; penning.

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pen (v.2)

"to confine or enclose in a pen," c. 1200, pennen, from Old English *pennian (only in compounds), from the source of pen (n.2). Related: Penned; penning.

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pen (n.3)

slang, "prison," 1884, shortening of penitentiary; earlier use (1845) probably is a figurative extension of pen (n.2) "enclosure for animals."

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pen- 

a Brythonic (Celtic) word for "head;" common in place names in Cornwall and Wales (such as Penzance; see also pendragon and Pennsylvania).

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pen-driver (n.)

jocular or slighting term for a clerk or author, by 1820, from pen (n.1) + driver. Earlier was quill-driver (by 1760).

The Author goes on, and tells us, "that the two thousand hogs were not driven into the sea by evil spirits, but by the two madmen, who, in one of their frantic fits, frightened them into it."— But is it not more than intimated that the men were restored to their right mind before the hogs took to their heels? Besides, that two madmen should drive two thousand such ungovernable creatures as hogs one way, does, I think, exceed the belief of any hog-driver on the road, if not of the pen-driver in his closet. [introduction to "Beelzebub Driving and Drowning his Hogs," a sermon on Mark v.12, 13, by James Burgess, 1820]
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*(s)pen- 

Proto-Indo-European root meaning "to draw, stretch, spin."

It forms all or part of: append; appendix; avoirdupois; compendium; compensate; compensation; counterpoise; depend; dispense; equipoise; expend; expense; expensive; hydroponics; impend; painter (n.2) "rope or chain that holds an anchor to a ship's side;" pansy; penchant; pend; pendant; pendentive; pending; pendular; pendulous; pendulum; pension; pensive; penthouse; perpendicular; peso; poise; ponder; ponderous; pound (n.1) "measure of weight;" prepend; prepense; preponderate; propensity; recompense; span (n.1) "distance between two objects;" span (n.2) "two animals driven together;" spangle; spanner; spend; spider; spin; spindle; spinner; spinster; stipend; suspend; suspension.

It is the hypothetical source of/evidence for its existence is provided by: Latin pendere "to hang, to cause to hang," pondus "weight" (perhaps the notion is the weight of a thing measured by how much it stretches a cord), pensare "to weigh, consider;" Greek ponos "toil," ponein "to toil;" Lithuanian spendžiu, spęsti "lay a snare;" Old Church Slavonic peti "stretch, strain," pato "fetter," pina "I span;" Old English spinnan "to spin," spannan "to join, fasten; stretch, span;" Armenian henum "I weave;" Greek patos "garment," literally "that which is spun;" Lithuanian pinu "I plait, braid," spandau "I spin;" Middle Welsh cy-ffiniden "spider;" Old English spinnan "draw out and twist fibers into thread," spiðra "spider," literally "spinner."

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pen-pal (n.)

also pen pal, "friend or contact with whom a regular correspondence is conducted," 1931, from pen (n.1) + pal (n.). gradually replacing earlier pen-friend (1919).

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play-pen (n.)

also playpen, "enclosure in which a young child may play," 1916, from play + pen (n.2).

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