1:1,000,000, for example (5)

I believe the answer is:

ratio

(Other definitions for ratio that I've seen before include "Eg, 4 to 3" , "Percentage" , "eg 1:3" , "Relation between two amounts" , "Quotient, proportion" .)

I've seen this clue in the USA Today.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.