A period of time set aside to teach or learn something, especially in school or classes. It can also mean something important you learn from an experience, especially a mistake.
From Old French *leçon* and Latin *lectio* meaning “reading” or “a thing read,” from *legere* (to read). Originally, a lesson was a reading aloud, often from religious texts.
Lessons used to be literally readings—someone read, others listened. Now we expect interaction, practice, and feedback, but we still use a word born from sitting quietly and listening.
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