What is Denning?

Denning definition and meaning on Dictionary terms:
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, den