Den

1. A small cavern or hollow place in the side of a hill, or among rocks; especially, a cave used by a wild animal for shelter or concealment.

   Daniel was put into the lions’ den.

2. A squalid or wretched place; a haunt.

   a den of vice

3. A comfortable room not used for formal entertaining.
4. A narrow glen; a ravine; a dell.

verb

To ensconce or hide oneself in (or as in) a den.

1. An old French coin worth one-twelfth of a sou.
2. A unit of linear density which indicates the fineness of fiber or yarn, equal to one gram per 9000 meters, used especially to measure or indicate the fineness of hosiery. Originally equal to the weight of a denier coin per 9600 aunes.

noun

Person who denies something.

1. (temporal location) At that time.

   He was happy then.

2. (temporal location) Soon afterward.

   He fixed it, then left.

3. (sequence) Next in order; in addition.

   There are three green ones, then a blue one.

4. In that case.

   If it’s locked, then we’ll need the key.

5. (sequence) At the same time; on the other hand.

   That’s a nice shirt, but then, so is the other one.

6. (affirmation) Used to contradict an assertion.