a preconception; a preconceived notion or prejudice held before knowing the facts.
面接で先入観を持たれないように、最初の印象づくりは大切だ。
It's important to make a good first impression so you don't get judged by preconceptions in an interview.
先入観を捨てて、データに基づいて判断しよう。
Let's discard preconceptions and make a judgment based on the data.
その映画についての先入観が強くて、最初は楽しめなかった。
I had strong preconceptions about that movie, so at first I couldn't enjoy it.