ratio Definition

ratio
noun ratios

1. The number or degree of one class of things in relation to another, or between one thing and another, expressed as a proportion.

Example: The ratio of dogs to cats is 5 to 3
Thesaurus: proportion, share, percentage, balance, correlation, rate, correspondence, relationship.
2. The number of times one mathematical quantity can be divided by another.

Etymology: 17c: from Latin ratio reckoning, from reri, ratus to think.