Question

fancy means :
a false idea or illusion that is the product of the imagination
a quantity obtained by the addition of a group of numbers
a chapel or place of worship that has its own altar
a round shape formed by a series of concentric circles
get a hint: 50/50

Explanation:

The word "fancy" can mean a false idea or illusion that is the product of the imagination. For example, "She had a fancy that someone was following her." The other options describe different words: "a quantity obtained by the addition of a group of numbers" is a sum (Mathematics - Algebra); "a chapel or place of worship that has its own altar" is an altar (Arts - Religion); "a round shape formed by a series of concentric circles" is a circle - related shape (Mathematics - Geometry).

Answer:

a false idea or illusion that is the product of the imagination