n.
Pronunciation: ' r ā -( ˌ )sh ō , -sh ē - ˌ ō
Function: noun
Inflected Form: plural ra · tios
Etymology: Latin, computation, reason ― more at REASON
Date: 1660
1 a : the indicated quotient of two mathematical expressions b : the relationship in quantity, amount, or size between two or more things : PROPORTION
2 : the expression of the relative values of gold and silver as determined by a country's currency laws