1. (n.) 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.

2. (n.) Harmonic relation between parts, or between different things of the same kind; symmetrical arrangement or adjustment; symmetry; as, to be out of proportion.

3. (n.) The portion one receives when a whole is distributed by a rule or principle; equal or proper share; lot.

4. (n.) A part considered comparatively; a share.

5. (n.) 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.

6. (n.) The rule of three, in arithmetic, in which the three given terms, together with the one sought, are proportional.

7. (v.) 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.

8. (v.) To form with symmetry or suitableness, as the parts of the body.

9. (v.) To divide into equal or just shares; to apportion.

accommodate accord acreage adapt addition adjust adjust to agreement allegory allotment allowance amount amplitude analogousness analogy approximation area arithmetical proportion arrangement array assimilate attune balance balancing beauty big end bigger half bigness bilateral symmetry bit bite body breadth budget bulk caliber cancel capacity change chunk coequality coextension commensurability commission comparability comparableness comparative anatomy comparative degree comparative grammar comparative judgment comparative linguistics comparative literature comparative method comparativeness compare comparing comparison compass compensate concinnity concord conform conformity confrontation confrontment congruity consistency contingent continued fraction continuum contrast contrastiveness coordinate correlation correspondence counterbalance counterpoise countervail coverage cut cut to deal degree deployment depth destiny diameter differentiation dimension dimensions disposal disposition distinction distinctiveness distribution divide dividend division dole dynamic symmetry emptiness empty space end enlarge equal share equality equalize equate equation equilibrium equipoise equipollence equiponderance equity equivalence equivalency euphony eurythmics eurythmy even even up evenness evolution expanse expansion extension extent extrapolation fate field finish fit fix formation fraction galactic space gauge gear to geometric ratio girth grade graduate greatness group half halver harmonic proportion harmonize harmony height helping homologate homologize identity improper fraction infinite space integrate integration interest interpolation interstellar space interval inversion involution justice keeping key to largeness layout leap length level levelness likeness likening lineup lot magnitude make plumb make uniform mark marshaling mass match matching measure measuredness measurement meed mess metaphor modicum modify modulate moiety multilateral symmetry multiplication notation notch nothingness nuance opposing opposition order orderedness organization outer space par parallelism parity part pas peace peg percent percentage period piece pitch plane plateau point poise polarity portion practice pro rata proportionability proportionality proportionate proportions prorate put in tune quantum quiet quietude quota quotum radius rake-off range rank rate ratio ration reach reconcile rectify reduction regularity regularize regulate relation relationship