"in a lesson" is a perfectly correct and usable phrase in written English.
For example, you could use it in a sentence like this: "We discussed the topic in a lesson yesterday."
She also learned that you should never spend more money than what you bring in; a lesson instilled in her by her parents growing up.
Back at the Bashy Bus's Allman Town Primary School stop, an 11-year-old student named Anastasia took in a lesson about the dangers of peer pressure.
"I will use pieces of it in a lesson".
Below, it all comes together in a lesson we hope will inspire you all season long.
"Having to get to this location to be in a lesson is now obsolete.
Nothing like this had ever appeared in a lesson in her third-grade classroom.
He played the ukulele for his passengers and threw in a lesson for anyone interested.
And, in a lesson for all funders, he did so without fuss or desire for publicity.
"I was in a lesson the other day and a student asked, 'What is a lampshade?'.
Seeing them become absorbed in a lesson is a constant source of motivation.
Inside the warm cabin, one group took part in a lesson in living within their means.
