An evergreen tree (usually a conifer), or an artificial tree made to resemble this, which is typically decorated with lights and ornaments and often an angel or star at its tip, and used as a decoration during the Christmas holiday season. • Something which resembles a Christmas tree (sense 1) in appearance (for example, in having coloured lights) or shape. • Something which is elaborately decorated. • A pattern of muscles visible in the lower back, resembling in outline the shape of a conifer. • A panel of indicator lights in an aircraft or a submarine. • An alert area at an air base with aircraft parked in stubs arranged at a 45-degree angle to a central taxiway to enable them to move rapidly to a runway; these were constructed by the Strategic Air Command of the United States Air Force during the Cold War (generally 1947–1991). • A pole with lights, similar to a traffic signal, used for signalling the start of an automobile race. • A collection of gauges, valves, and other components installed at the top of wellhead to control the flow of gas or oil. • A 4-3-2-1 formation, with four defenders, three centre midfielders, two attacking midfielders and a striker in a triangular pattern. • A Christmas party, especially one organized for (underprivileged) children by a charity, a school, etc. • Often with a descriptive word: any of several shrubs or trees native to Australia which bloom in summer at the end of the year around Christmastime, and so may be used as a Christmas decoration; especially the fire tree or moodjar (Nuytsia floribunda). • Synonym of pohutukawa (“a coastal evergreen tree, Metrosideros excelsa, native to New Zealand and producing a brilliant display of red flowers with prominent stamens around Christmastime”)