Definition of preconceived adjective from the Oxford Advanced Learner's Dictionary

 

preconceived

 adjective
adjective
BrE BrE//ˌpriːkənˈsiːvd//
 
; NAmE NAmE//ˌpriːkənˈsiːvd//
 
[only before noun]
 
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(of ideas, opinions, etc.) formed before you have enough information or experience of something Before I started the job, I had no preconceived notions of what it would be like.
See the Oxford Advanced American Dictionary entry: preconceived