1. an opinion formed beforehand without adequate evidence; "he did not even try to confirm his preconceptions"
(synonym) prepossession, parti pris, preconceived opinion, preconceived idea, preconceived notion
(hypernym) opinion, sentiment, persuasion, view, thought
2. a partiality that prevents objective consideration of an issue or situation
(synonym) bias, prejudice
(hypernym) partiality, partisanship
(hyponym) taboo, tabu