Definition of "lesson" []

• Something to be learned: lessons from observing nature. (noun)
• A period of instruction; a class. (noun)
• An assignment or exercise in which something is to be learned. (noun)
• The act or an instance of instructing; teaching. (noun)
• An experience, example, or observation that imparts beneficial new knowledge or wisdom. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "And so we see that the second lesson taught by the Transfiguration was the _lesson of instruction_."
• "The plain lesson from the Times series is that if educators will not examine their own practice and build on it, someone else will do it for them ... and to them."
• "The main lesson is that it is surprising that so many people could be fooled."