› [C] an extremely large amount of money: pay/spend a fortune The company needs to spend a fortune to bring all of its stores up to scratch.make/lose a fortune Businesses will lose a fortune after the peak tourist season disaster. The cars on this list won't cost a fortune to insure. They had spent a small fortune on television advertising. › [C] a large amount of valuable property or money that someone has collected or inherited: Her personal fortune was estimated at £24 million. He is heir to a $3billion oil fortune, the latest generation of the 31st richest family in the US. fortunes [plural] › the successes or failures that a person, company, or industry has at a particular time: the fortunes of sb/sth Political and financial factors will also affect the fortunes of these companies.sb's/sth's fortunes He proved himself highly effective in turning around the car manufacturer's fortunes.a change/decline/improvement in the fortunes of sth/sb The rapid improvement in the fortunes of the paper industry shows clearly how difficult it is to predict the future at any time.