Other forms: lessons
A lesson is one teaching hour on one subject. A maths lesson, a driving lesson, learn your lesson.
It names a fixed block of teaching and, by extension, anything learned from experience: let that be a lesson, learn the lesson. In church, a lesson is a passage of scripture read aloud, which is the original sense — the Latin means a reading. Note teach somebody a lesson, meaning to punish; and that a lesson is what is taught and a class is who is taught it.
1nounlessonOne teaching period on one subject.
“She has a piano lesson every Thursday after school.”
2nounlearnedSomething learned from experience.
“Losing all my work taught me a lesson: always make a backup.”
Too few real examples of this word to estimate which sense is commonest.
lesson is a teaching period or learning.
Also accepted in games: class
Old French leçon comes from Latin lectio, a reading, from legere, to read or gather. Lecture, legend and collect come from the same reading.
Proto-Indo-European
*leǵ-
Latin
lēctiō — a reading
Old French
leçon
Middle English
lessoun
English, today
lesson
Built from
From Middle English lessoun, from Old French leçon, from Latin lēctiō (“a reading”), from legō (“to read; to gather”). a doublet of lection.
Etymology from Wiktionary, CC BY-SA