the act of using
"he warned against the use of narcotic drugs"
"skilled in the utilization of computers"
the customary manner in which a language (or a form of a language) is spoken or written
"English usage"
"a usage borrowed from French"
Habit, practice.
"The new software update changed our daily usage of the keyboard shortcuts to make them more efficient."
A custom or established practice.
"The new software update changed our usage of the login button, so everyone has to click it in a different spot now."
In plain English: Usage is simply how often something is used or the way people use it.
"The usage of this public park increases significantly during weekends."
The word entered English from Anglo-Norman and Old French, where it originally meant the act of using something. Its meaning has remained consistent since arriving in Middle English.