The definition of a preconception is a notion, opinion or idea that you have formed before going into something, sometimes based on bias or prejudice. An example of a preconception is when you make up your mind in advance what someone is going to be like without knowing the person.

How do you use preconceptions in a sentence?

an opinion formed beforehand without adequate evidence 2. a partiality that prevents objective consideration of an issue or situation. 1. He proceeds to take apart every preconception anyone might have ever had about him.

What do you mean by preconceptions?

noun. a conception or opinion formed beforehand.