Meaning of proportion by Wiktionary Dictionary
Explanation of proportion by Wordnet Dictionary
proportion
 ( countable ) A quantity of something that is part of the whole amount or number .
 ( uncountable ) Harmonious relation of parts to each other or to the whole .
 ( countable ) Proper or equal share .
 ( uncountable ) The relation of one part to another or to the whole with respect to magnitude, quantity, or degree .
 ( mathematics, countable ) A statement of equality between two ratios .
 ( countable, chiefly plural: ) size
 2012 May 20, Nathan Rabin, “TV: Review: THE SIMPSONS ( CLASSIC ): “Marge Gets A Job” ( season 4, episode 7; originally aired 11/05/1992 )”, The Onion AV Club:
 What other television show would feature a gorgeously designed sequence where a horrifically mutated Pierre and Marie Curie, their bodies swollen to Godzillalike proportions from prolonged exposure to the radiation that would eventually kill them, destroy an Asian city with their bare hands like vengeancecrazed monsterGods?
 2012 May 20, Nathan Rabin, “TV: Review: THE SIMPSONS ( CLASSIC ): “Marge Gets A Job” ( season 4, episode 7; originally aired 11/05/1992 )”, The Onion AV Club:
 ( art ) To set or render in proportion .
 proportion in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
 proportion in The Century Dictionary, The Century Co., New York, 1911
Etymology
From Middle English proporcion, from Old French proportion, from Latin proportio ( “comparative relation, proportion, symmetry, analogy” ), from pro ( “for, before” ) + portio ( “share, part” ); see portion .
Noun
proportion ( countable and uncountable; plural: proportions )
Derived terms
Verb
proportion ( thirdperson singular simple present proportions present participle proportioning, simple past and past participle proportioned )
External links
Explanation of proportion by Wordnet Dictionary
proportion

harmonious arrangement or relation of parts or elements within a whole ( as in a design )

the relation between things ( or parts of things ) with respect to their comparative quantity, magnitude, or degree
 an inordinate proportion of the book is given over to quotations
 a dry martini has a large proportion of gin

the quotient obtained when the magnitude of a part is divided by the magnitude of the whole
 Proportion n. [F., fr. L. proportio; pro before + portio part or share. See Portion.]
1. The relation or adaptation of one portion to another, or to the whole, as respect magnitude, quantity, or degree; comparative relation; ratio; as, “the proportion of the parts of a building, or of the body”.
The image of Christ, made after his own proportion. Ridley.
Formed in the best proportions of her sex. Sir W. Scott.
Documents are authentic and facts are true precisely in proportion to the support which they afford to his theory. Macaulay.
2. Harmonic relation between parts, or between different things of the same kind; symmetrical arrangement or adjustment; symmetry; as, “to be out of proportion”. “Let us prophesy according to the proportion of faith.” Rom. xii. 6.
3. The portion one receives when a whole is distributed by a rule or principle; equal or proper share; lot.
Let the women . . . do the same things in their proportions and capacities. Jer. Taylor.
4. A part considered comparatively; a share.
5. ( Math. ) The equality or similarity of ratios, especially of geometrical ratios; or a relation among quantities such that the quotient of the first divided by the second is equal to that of the third divided by the fourth;  called also geometrical proportion, in distinction from arithmetical proportion, or that in which the difference of the first and second is equal to the difference of the third and fourth.
☞ Proportion in the mathematical sense differs from ratio. Ratio is the relation of two quantities of the same kind, as the ratio of 5 to 10, or the ratio of 8 to 16. Proportion is the sameness or likeness of two such relations. Thus, 5 to 10 as 8 to 16; that is, 5 bears the same relation to 10 as 8 does to 16. Hence, such numbers are said to be in proportion. Proportion is expressed by symbols thus:
a:b::c:d, or a:b = c:d, or a/b = c/d.
The rule of three, in arithmetic, in which the three given terms, together with the one sought, are proportional.
Continued proportion, Inverse proportion, etc. See under Continued, Inverse, etc.  Harmonical proportion or Musical proportion, a relation of three or four quantities, such that the first is to the last as the difference between the first two is to the difference between the last two; thus, 2, 3, 6, are in harmonical proportion; for 2 is to 6 as 1 to 3. Thus, 24, 16, 12, 9, are harmonical, for 24:9::8:3.  In proportion, according as; to the degree that. “In proportion as they are metaphysically true, they are morally and politically false.”
Burke.
 Proportion, v. t. [imp. & p. p. Proportioned ; p. pr. & vb. n. Proportioning.] [Cf. F. proportionner. Cf. Proportionate, v.]
1. To adjust in a suitable proportion, as one thing or one part to another; as, “to proportion the size of a building to its height; to proportion our expenditures to our income.”
In the loss of an object we do not proportion our grief to the real value . . . but to the value our fancies set upon it. Addison.
2. To form with symmetry or suitableness, as the parts of the body.
Nature had proportioned her without any fault. Sir P. Sidney.
3. To divide into equal or just shares; to apportion.
Verb
Noun
Definition of proportion by GCIDE Dictionary