1) Engineering ratio 
Fineness ratio is a term used in naval architecture and aerospace engineering to describe the overall shape of a streamlined body. Specifically, it is the ratio of the length of a body to its maximum width; shapes that are `short and fat` have a low fineness ratio, those that are `long and skinny` have high fineness ratios. Aircraft that spend...
the ratio of the length of a streamlined body, as a rocket or airplane hull, to its maximum diameter. · See(def. 4a).