the lair or shelter of a wild animal, especially a predatory mammal.
a room, often secluded, in a house or apartment, designed to provide a quiet, comfortable, and informal atmosphere for conversation, reading, writing, etc.
a cave used as a place of shelter or concealment.
a squalid or vile abode or place: dens of misery.
one of the units of a cub scout pack, analogous to a patrol in the Boy Scouts.
verb (used with object), denned, denning.
to drive or pursue (an animal) into its den.
to kill (an animal) inside its den.
verb (used without object), denned, denning.
to live in or as if in a den.

before 1000; Middle English; Old English denn; compare early Dutch denne floor, cave, den, German Tenne floor Unabridged

Den. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
den (dɛn)
1.  the habitat or retreat of a lion or similar wild animal; lair
2.  a small or secluded room in a home, often used for carrying on a hobby
3.  a squalid or wretched room or retreat
4.  a site or haunt: a den of vice
5.  (Scot) a small wooded valley; dingle
6.  dialect (Scot), (Northern English) a place of sanctuary in certain catching games; home or base
vb , dens, denning, denned
7.  (intr) to live in or as if in a den
[Old English denn; related to Old High German tenni threshing floor, early Dutch denne low ground, den, cave]

abbreviation for

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. denn "wild animal's lair," from P.Gmc. *danjan. Sense of "small room" is 1771, originally colloquial.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
  1. Denver Broncos

  2. Denver International Airport

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Bible Dictionary

Den definition

a lair of wild beasts (Ps. 10:9; 104:22; Job 37:8); the hole of a venomous reptile (Isa. 11:8); a recess for secrecy "in dens and caves of the earth" (Heb. 11:38); a resort of thieves (Matt. 21:13; Mark 11:17). Daniel was cast into "the den of lions" (Dan. 6:16, 17). Some recent discoveries among the ruins of Babylon have brought to light the fact that the practice of punishing offenders against the law by throwing them into a den of lions was common.

Easton's 1897 Bible Dictionary
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Example sentences
On one side of the living area, a movable wall will set off a den that can
  double as a guest room.
When it was victorious, the kraken would drag the ichthyosaur's corpse back to
  its den for a feast.
It would also make this the ultimate nerd's gaming den.
In lean years the pups leave the den earlier, to hunt on their own in a land
  where success is never a sure thing.
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