Layer/ˈleɪər/ Definition 1 of 5Pro Tip 1/3Visual Imagery Picture layers as items stacked or spread out over one another, making a larger whole. A layer of icing covered the cake. Pro Tip 2/3Quantity Coverage Layer can indicate a specific amount that covers a certain area. Add another layer of bricks for support. Pro Tip 3/3Multiple Applications Use 'layer' to describe a variety of coverings, from natural to man-made. A thick layer of leaves covered the forest floor.