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 a to b by a/b; or (less commonly) the second term is made the dividend; as, a:b = b/a. [1913 Webster]
Hence, fixed relation of number, quantity, or degree; rate; proportion; as, the ratio of representation in Congress. [1913 Webster]

Compound ratio, Duplicate ratio, Inverse ratio, etc. See under Compound, Duplicate, etc. -- Ratio of a geometrical progression, the constant quantity by which each term is multiplied to produce the succeeding one.

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OXFORD DICTIONARY

ratio, n. (pl. -os) the quantitative relation between two similar magnitudes determined by the number of times one contains the other integrally or fractionally (in the ratio of three to two; the ratios 1:5 and 20:100 are the same).

Etymology

L (as RATE(1))

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THESAURUS

ratio

Vernunft, amount, analogousness, arithmetical proportion, balance, brain, brains, caliber, commensurability, comparability, comparableness, comparativeness, compass, conception, continued fraction, correlation, correspondence, cut, degree, discourse of reason, discursive reason, equivalence, esprit, extent, fraction, geometric ratio, grade, gray matter, harmonic proportion, head, headpiece, height, improper fraction, intellect, intellection, intellectual faculty, intelligence, interval, leap, level, mark, measure, mens, mental capacity, mentality, mind, notch, nous, nuance, pas, peg, percent, percentage, period, pitch, plane, plateau, point, power of reason, proportion, proportionability, psyche, quota, quotum, range, rate, rationality, reach, reason, reasoning, reasoning faculty, relationship, remove, round, rule of three, rung, scale, scope, shade, shadow, similarity, smarts, space, stair, standard, step, stint, tread, understanding

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ROGET THESAURUS

ratio

Relation

N relation, bearing, reference, connection, concern, cognation, correlation, analogy, similarity, affinity, homology, alliance, homogeneity, association, approximation, filiation, interest, relevancy, dependency, relationship, relative position, comparison, ratio, proportion, link, tie, bond of union, relative, correlative, cognate, relating to, relative to, in relation with, referable or referrible to, belonging to, appurtenant to, in common with, related, connected, implicated, associated, affiliated, allied to, en rapport, in touch with, approximative, approximating, proportional, proportionate, proportionable, allusive, comparable, in the same category, like, relevant, applicable, equiparant, relatively, pertinently, thereof, as to, as for, as respects, as regards, about, concerning, anent, relating to, as relates to, with relation, with reference to, with respect to, with regard to, in respect of, while speaking of, a propos of, in connection with, by the way, by the by, whereas, for as much as, in as much as, in point of, as far as, on the part of, on the score of, quoad hoc, pro re nata, under the head of, of, in the matter of, in re, thereby hangs a tale.

Degree

N degree, grade, extent, measure, amount, ratio, stint, standard, height, pitch, reach, amplitude, range, scope, caliber, gradation, shade, tenor, compass, sphere, station, rank, standing, rate, way, sort, point, mark, stage, intensity, strength, comparative, gradual, shading off, within the bounds, by degrees, gradually, inasmuch, pro tanto, however, howsoever, step by step, bit by bit, little by little, inch by inch, drop by drop, a little at a time, by inches, by slow degrees, by degrees, by little and little, in some degree, in some measure, to some extent, di grado in grado.

Number

N number, symbol, numeral, figure, cipher, digit, integer, counter, round number, formula, function, series, sum, difference, complement, subtrahend, product, multiplicand, multiplier, multiplicator, coefficient, multiple, dividend, divisor, factor, quotient, submultiple, fraction, rational number, surd, irrational number, transcendental number, mixed number, complex number, complex conjugate, numerator, denominator, decimal, circulating decimal, repetend, common measure, aliquot part, prime number, prime, relative prime, prime factor, prime pair, reciprocal, totient, binary number, octal number, hexadecimal number, permutation, combination, variation, election, ratio, proportion, comparison, progression, arithmetical progression, geometrical progression, harmonical progression, percentage, permilage, figurate numbers, pyramidal numbers, polygonal numbers, power, root, exponent, index, logarithm, antilogarithm, modulus, base, differential, integral, fluxion, fluent, numeral, complementary, divisible, aliquot, reciprocal, prime, relatively prime, fractional, decimal, figurate, incommensurable, proportional, exponential, logarithmic, logometric, differential, fluxional, integral, totitive, positive, negative, rational, irrational, surd, radical, real, complex, imaginary, finite, infinite, impossible, numerically, modulo.

Apportionment

N apportionment, allotment, consignment, assignment, appointment, appropriation, dispensation, distribution, division, deal, repartition, partition, administration, dividend, portion, contingent, share, allotment, fair share, allocation, lot, measure, dose, dole, meed, pittance, quantum, ration, ratio, proportion, quota, modicum, mess, allowance, suerte, apportioning, respective, respectively, each to each.

Comparison

N comparison, collation, contrast, identification, comparative estimate, relative estimate, relativity, simile, similitude, analogy (similarity), allegory, matching, pattern-matching, ratio, proportion (number), discrimination, indiscrimination, identification, comparative, metaphorical, compared with, comparable, judged by comparison, relatively, as compared with, comparisons are odious, comparisons are odorous.

See related words and definitions of word "ratio" in Indonesian