Anteroom/ˈæntiruːm/ Definition 1 of 1Pro Tip 1/3Place of Transition An anteroom serves as a transitional space before entering the main area. They discussed their strategy in the anteroom before the conference. Pro Tip 2/3Preparation Zone An anteroom can be a space where people prepare mentally or physically before an event. The performers tuned their instruments in the anteroom. Pro Tip 3/3Privacy Aspect Anterooms can offer a degree of privacy before entering a public or formal space. The speaker reviewed his notes in the privacy of the anteroom.