Definition of use:

part of speech: verb

To employ; to apply or handle for some purpose; to consume to accustom; to render familiar by practice; to be accustomed; to be wont.

part of speech: noun

State of being employed to any purpose; occasion or need to employ; the quality which makes a thing proper for a purpose; benefit; advantage; habit; in law, profit; benefit.

part of speech: verb intransitive

To be accustomed.