Sensei (先生) means "teacher." It's primarily used to address or refer to school teachers. However, it's also a polite honorific used for other professionals like doctors, lawyers, or experts in a particular field, showing respect for their knowledge and authority. Example: 先生、ありがとうございます。(Sensei, arigatō gozaimasu.) = Thank you, teacher.

教師や医者など、尊敬する専門家を呼ぶ時に使います。例：先生、ありがとうございます。