A small circle or gathering of specialists (writers etc).
A dining room, especially one on an upper floor (traditionally the room in which the Last Supper took place).
A small, exclusive group of individuals, usually according to lifestyle or social status; a cabal.
A group of related web sites that link to each other, like a webring but with exclusive membership determined by the clique owner.
A subgraph isomorphic to a complete graph.
To associate together in a clannish way; to act with others secretly to gain a desired end; to plot.