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rational expectation
rational horizon
rational number
rationale
rationalisation
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ratio

ra·tio [ ráyshō, ráyshi ō ] (plural ra·tios)


noun 
Definition:
 
1. proportional relationship: a proportional relationship between two different numbers or quantities
The ratio of teachers to students at that school is 1 to 27

2. mathematics one number divided by another: a quotient of two numbers or expressions arrived at by dividing one by the other

3. U.S. finance relative value of gold and silver: the value of gold and silver relative to each other in a monetary system based on these two metals

[Mid-17th century. < Latin, "calculation" (see reason)]
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