lesson

[les-uhn]
noun
1.
a section into which a course of study is divided, especially a single, continuous session of formal instruction in a subject: The manual was broken down into 50 lessons.
2.
a part of a book, an exercise, etc., that is assigned to a student for study: The lesson for today is on page 22. He worked assiduously at his music lesson.
3.
something to be learned or studied: the lessons of the past.
4.
a useful piece of practical wisdom acquired by experience or study: That accident certainly taught him a lesson in careful driving.
5.
something from which a person learns or should learn; an instructive example: Her faith should serve as a lesson to all of us.
6.
a reproof or punishment intended to teach one better ways.
7.
a portion of Scripture or other sacred writing read or appointed to be read at a divine service; lection; pericope.
verb (used with object)
8.
to teach; instruct; give a lesson to.
9.
to admonish or reprove.

Origin:
1175–1225; Middle English lesso(u)n < Old French leçon < Latin lēctiōn- (stem of lēctiō) lection

lessen, lesson.
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World English Dictionary
lesson (ˈlɛsən)
 
n
1.  a.  a unit, or single period of instruction in a subject; class: an hour-long music lesson
 b.  the content of such a unit
2.  material assigned for individual study
3.  something from which useful knowledge or principles can be learned; example
4.  the principles, knowledge, etc, gained
5.  a reprimand or punishment intended to correct
6.  a portion of Scripture appointed to be read at divine service
 
vb
7.  rare (tr) to censure or punish
 
[C13: from Old French leçon, from Latin lēctiō, from legere to read]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

lesson
early 13c., "a reading aloud from the Bible," also "something to be learned by a student," from O.Fr. leçon, from L. lectionem (nom. lectio) "a reading," from lectus, pp. of legere "to read" (see lecture). Transf. sense of "an occurrence from which something can be learned" is from 1580s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She started taking lessons when she was recovering from a painful divorce and
  learned a lot more than a few dance steps.
Over in the plant lab, hands-on exhibits take basic botany lessons out of the
  textbook realm.
After reading this, you may find yourself signing up for eel-catching lessons.
Teachers can use or adapt our lessons across subject areas and levels.
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