English to English

noun (n)

• an opinion formed beforehand without adequate evidence(noun.cognition)

  Example:
  He did not even try to confirm his preconceptions.
  

  Synonym:
  parti pris, preconceived idea, preconceived notion, preconceived opinion, prepossession
  

  source: wordnet30
• a partiality that prevents objective consideration of an issue or situation(noun.cognition)

  Synonym:
  bias, prejudice
  

  source: wordnet30
• The act of preconceiving; conception or opinion previously formed.(noun)

  source: webster1913