Control (by agreement among producers or by government) of the price of a commodity in interstate commerce WordNet 3.0 & Open English WordNet

Price fixing is an anticompetitive agreement between participants on the same side in a market to buy or sell a product, service, or commodity only at a fixed price, or maintain the market conditions such that the price is maintained at a given level by controlling supply and demand. Wikipedia

An agreement between business competitors to sell the same product or service at the same price Wikipedia Disambiguation

Agreement over prices between participants on the same side in a market Wikidata