December Purchase is a term used to describe the items that are typically purchased during the month of December. This includes a tree, TINSEL, and FIR. A tree is a large plant with a trunk and branches that can be decorated for the holidays. TINSEL is a type of decorative material made of thin strips of shiny metal or plastic. FIR is a type of evergreen tree with needles and cones that is often used as a Christmas tree.