1. an opinion or idea formed beforehand without adequate evidence or experience

Examples

• She tried to approach the interview without any preconceptions about the candidate.
• His preconceptions about the city were completely wrong after he visited.
• The teacher encouraged students to challenge their preconceptions about history.
• Many preconceptions about different cultures are based on stereotypes.
• The scientist set aside her preconceptions to examine the data objectively.
• Common preconceptions about teenagers often prove to be unfair generalizations.