Question
I started watching Japanese dramas and noticed students call their teacher “sensei,” but I’ve also heard doctors and even a manga artist called sensei. A classmate asked me why his karate instructor is sensei but his piano tutor is just “san.” What does sensei mean exactly?
Answer by Professional Japanese Teacher
先生（せんせい）
Sensei
Teacher / doctor / master — a respectful title for someone with recognized expertise
Great question — you’ve already spotted that sensei is much broader than “teacher.” You use it for schoolteachers, professors, doctors, dentists, lawyers, accountants, novelists, manga artists, martial-arts masters, and even politicians. The thread is recognized expertise the speaker wants to honor. The kanji 先 (ahead) and 生 (born) loosely point to “someone further along the path” — nice trivia, but not something you need to think about to use the word.
On your karate vs piano question, a dojo treats its instructor as a true master, so sensei fits naturally. A casual piano tutor is usually just Tanaka-san unless the student really sees them as a master.
Two quick tips. Don’t call yourself sensei — it sounds boastful. And Tanaka-sensei stands on its own; you don’t add san on top.
