先輩 (senpai) means 'senior.' It refers to someone who has more experience than you, such as an older student at school or a more experienced colleague at work. Respecting senpai is important in Japanese culture. For example, '先輩に相談しました' (I consulted my senior).

学校や職場で自分より年上か、先に入った人です。例：「先輩に教えてもらう」