| ceiling [`sē·liŋ] BUILDING CONSTRUCTION The covering made of plaster, boards, or other material that constitutes the overhead surface in a room. MATHEMATICS The smallest integer that is equal to or greater than a given real number a; symbolized ⌈a⌉. METEOROLOGY In the United States, the height ascribed to the lowest layer of clouds or of obscuring phenomena when it is reported as broken, overcast, or obscuration and not classified as thin or partial. |