A situation, by legal privilege or other agreement, in which solely one party (company, cartel etc.) exclusively provides a particular product or service, dominating that market and generally exerting powerful control over it.

A board game in which players use play money to buy and trade properties, with the objective of forcing opponents into bankruptcy.

plural of monopoly

Play money. / (slang, often derogatory) Banknotes of foreign currency; especially those which are vibrant or flimsy.

plural of natural monopoly

Control over the market for a product which occurs when a firm gains large benefit from economies of scale, or from a superior business model or product, and is thus able to produce a very large percentage of the total market demand for a given product and unintentionally exclude meaningful competition via price structures.