1A lesson or moral learned from experience or a story; a precept that offers guidance.
この失敗からの教訓を忘れないでください。
Please don't forget the lesson learned from this failure.
物語には重要な教訓が含まれていることが多い。
Stories often contain important lessons.
彼の体験談は若手社員への教訓となった。
His account of experience served as a lesson for the young employees.