1. To write or to print on an item of mail the details of where it is to be delivered by the postal service: "People need to make sure that they are addressing their mail correctly if they want it to be delivered."
2. The process of delivering a formal spoken communication to an audience; such as, a formal speech or report: "Corinne addressed her fellow students during the assembly."
3. To use the proper name or title of a person when speaking or writing to him or her: "Laurel always addressed her professor as Dr. Kindle."