Definition

noun

The act of using.
“The use of torture has been condemned by the United Nations.”
The act of consuming alcohol or narcotics.
(followed by "of") Usefulness, benefit.
“What's the use of a law that nobody follows?”

verb

To utilize or employ.
To accustom; to habituate. (Now common only in participial form. Uses the same pronunciation as the noun; see usage notes.)
“soldiers who are used to hardships and danger”
(except in past tense) To habitually do; to be wont to do. (Now chiefly in past-tense forms; see used to.)
“I used to get things done.”