monopoly-n; 2 Senses

Sense Number 1: Exclusive control or possession of something, as in economics or other domains.

Commentary: MONOPOLY[+control]

When you have a monopoly, you can do almost anything.
There are laws to prohibit monopolies.

WordNet 3.0 Sense Numbers: 1, 2

Sense Number 2: (game) a board game in which players try to gain a monopoly on real estate as pieces advance around the board according to the throw of a die.

Commentary: MONOPOLY[+game]
NOTE: usually capitalized.

Let's play Monopoly tonight.
Monopoly is one of the best-selling games ever.

WordNet 3.0 Sense Numbers: 3