Definition of preconception noun from the Oxford Advanced Learner's Dictionary

 

preconception

 noun
noun
BrE BrE//ˌpriːkənˈsepʃn//
 
; NAmE NAmE//ˌpriːkənˈsepʃn//
 
[countable, usually plural, uncountable]
 
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an idea or opinion that is formed before you have enough information or experience synonym assumption a book that will challenge your preconceptions about rural life compare misconceptionExtra examples It is important to challenge society’s preconceptions about disabled people. It’s important that you come to this task with no preconceptions. Most people have preconceptions about old age. The facts refused to fit my preconceptions. They like this approach because it fits in with their own preconceptions. her preconceptions of life in the country
See the Oxford Advanced American Dictionary entry: preconception