Video shows what Christmas tree means. A conifer used during the Christmas holiday season, typically decorated with lights and ornaments and often a star or angel at its tip.. A pole with lights, similar to a traffic signal, used for signalling the start of an automobile race.. The collection of valves sometimes found at the top of a working oil well.. Christmas tree pronunciation. How to pronounce, definition by Wiktionary dictionary. Christmas tree meaning. Powered by MaryTTS