This is the 889th most frequent Japanese word.
勉強
"勉強" means "study."
Here, '勉強' is used idiomatically to imply giving a discount or price concession.
この自転車を勉強価格で買いました。
I bought this bicycle at a discounted price.
The word '勉強' is used to mean 'to study' as an action.
私は数学を勉強しています。
I am studying mathematics.
The word '勉強' refers to the act of studying, treated as a noun.