The relative magnitudes of two quantities (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
ratio
'the relative magnitudes of two quantities' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ratio that I've seen before include "E.g. sin i" , "Relative magnitude" , "Relationship of numbers" , "Quotient of two numbers" , "Proporation, quantitative relation" .)