Size

How large is the object? Size is described subjectively by "large and small" And objectively by dimensions. But a description is more likely to meaningful if it is comparative. For instance, "The boo, nine by six by three inches thick, (9x6x3), is the same lenght and width as your textbook but more than twice as thick" is more descriptive than either of the following. "The book is a large one" or "The book is 9 inches by six inches by 3 inches.