a measurement of the size of a pile of gravel, expressed in how many yards tall, long and wide it is. Cubic as used here means three-dimensional. Any
object's size can be
calculated by measuring these three
dimensions. For
example, if a
cube of a material is 2 feet wide, 3 feet tall and 4 feet long, the three measurements are combined (2 x 3 x 4 feet) and the
final figure (24) is its cubic size, or the cubic
space it occupies (24 cubic feet). When a pile of gravel is said to be 150.7-9 cubic yards it means the combination of its height, length and width equals 150 yards plus an additional 7/10 to 9/10 cubic yards.