Use definition: to employ for some purpose; put into service; make use of.. See examples of USE used in a sentence., use is the general word: to use a telephone; to use a saw and other tools; to use one's eyes; to use eggs in cooking. (What is used often has depreciated or been diminished, sometimes completely consumed: a used automobile; All the butter has been used., Define use. use synonyms, use pronunciation, use translation, English dictionary definition of use. v. used , us·ing , us·es v. tr. 1. To put into service or employ for a purpose: I used a whisk to beat the eggs., Definition of use noun from the Oxford Advanced Learner's Dictionary. [uncountable, singular] the act of using something; the state of being used. A ban was imposed on the use of chemical weapons. You can't justify the use of military force. I'm not sure that this is the most valuable use of my time., noun The act of using something; the application or employment of something for a purpose. noun The condition or fact of being used. noun The manner of using; usage. noun The permission, privilege, or benefit of using something. noun The power or ability to use something. noun The need or occasion to use or employ something., To put or bring into action or service; employ for or apply to a given purpose. To practice; exercise. To use one's judgment. To frequent; resort. To act or behave toward; treat. To use a friend badly. The act of using something; the application or employment of something for a purpose..