ratio
 ra·tio (rāʹshō, rāʹshē-ō')n. pl. ra·tios
1. Relation in degree or number between two similar things.
2. The relative value of silver and gold in a currency system that is bimetallic.
3. Mathematics. The relation between two quantities expressed as the quotient of one divided by the other:
The ratio of 7 to 4 is written 7:4 or 7/4. [Latin ratiō, calculation, from ratus, past participle of rērī, to reckon, consider. See ar- in Indo-European Roots.]
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