Learner's definition of FORTUNE
1 a [count] : a very large amount of money — usually singular
b [noncount], somewhat formal : a great amount of money or possessions : wealth
He won/made a fortune (by) gambling.
Their house is worth a fortune.
They spent a small fortune [=a surprisingly or unexpectedly large amount of money] on redecorating their house.
She made her/a fortune in real estate.
2 [noncount] : something that happens by chance : luck 3 fortunes [plural] : the good and bad things that happen to someone 4 [count] : the future that someone or something will have