from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Relation in degree or number between two similar things.
- n. The relative value of silver and gold in a currency system that is bimetallic.
- n. Mathematics A relationship between two quantities, normally expressed as the quotient of one divided by the other: The ratio of 7 to 4 is written 7:4 or 7/4.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A number representing a comparison between two things.
- n. The relative magnitudes of two quantities (usually expressed as a quotient).
- n. Short for ratio decidendi.
from the GNU version of the Collaborative International Dictionary of English
- n. The relation which one quantity or magnitude has to another of the same kind. It is expressed by the quotient of the division of the first by the second; thus, the ratio of 3 to 6 is expressed by 3/6 or 1/2; of a to b by a/b; or (less commonly) the second term is made the dividend; as, a:b = b/a.
- n. Hence, fixed relation of number, quantity, or degree; rate; proportion.
from The Century Dictionary and Cyclopedia
- n. The relation between two similar magnitudes in respect to quantity; the relation between two similar quantities in respect to how many times one makes so many times the other.
- n. Proportion of relations or conditions; coincident agreement or variation; correspondence in rate; equivalence of relative movement or change.
- n. Reason; cause: often used as a Latin word in current Latin phrases.
- n. In musical acoustics, the relation between the vibration-numbers of two tones. It is the physical or mathematical representation of the interval between them.
- n. In civil law. an account; a cause, or the giving of judgment therein.
- n. Loosely, a direct and simple ratio: as, the weights of bodies are in the direct ratio of their masses—that is, the weight of one is to that of another as the mass of the former is to that of the latter. Also direct proportion
- n. See progression.
- n. A ratio not compound.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree
- n. the relative magnitudes of two quantities (usually expressed as a quotient)
Latin ratiō, calculation, from ratus, past participle of rērī, to reckon, consider; see ar- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin ratio. (Wiktionary)