Proportion is about balance and how things fit together harmoniously. For example "That hound dog's tiny legs look out of proportion to that big fat body."

The prefix comes from the Latin pro meaning "on behalf of, for." If you're Proportion likes portions, and for them to be the right size. The cake's sweetness is in direct proportion to how much sugar you put in. It's a compliment to tell someone he or she has just the right proportions, but you might get slapped. It can also be a part of something, as in a significant proportion of our student body has dyed their hair purple.

Definitions of proportion
  1. noun
    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”
    synonyms: ratio
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    type of:
    magnitude relation, quantitative relation
    a relation between magnitudes
  2. noun
    the quotient obtained when the magnitude of a part is divided by the magnitude of the whole
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    case-fatality proportion
    the number of cases of a disease ending in death divided by the number of cases of the disease; usually expressed as a percentage or as the number of deaths per 1000 cases
    case-to-infection proportion, case-to-infection ratio
    the number of cases of a disease divided by the number of infections with the agent that causes the disease
    the proportion of a substance that is contained in a mixture or alloy etc.
    a quantity or amount or measure considered as a proportion of another quantity or amount or measure
    the ratio between the size of something and a representation of it
    golden mean, golden section
    the proportional relation between two divisions of line or two dimension of a plane figure such that short : long :: long : (short + long)
    pct, per centum, percent, percentage
    a proportion in relation to a whole (which is usually the amount per hundred)
    batting average
    (an extension of the baseball term) the proportion of times some effort succeeds
    absentee rate
    the percentage of workers who do not report to work
    occupancy rate
    the percentage of all rental units (as in hotels) are occupied or rented at a given time
    vacancy rate
    the percentage of all rental units (as in hotels) that are unoccupied or not rented at a given time
    unemployment rate
    the percentage of the work force that is unemployed at any given date
    type of:
    the ratio of two quantities to be divided
  3. noun
    balance among the parts of something
    synonyms: symmetry
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    lack of proportion; imbalance among the parts of something
    type of:
    balance, counterbalance, equilibrium, equipoise
    equality of distribution
  4. noun
    harmonious arrangement or relation of parts or elements within a whole (as in a design)
    synonyms: balance, proportionality
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    type of:
    arrangement, placement
    the spatial property of the way in which something is placed
  5. noun
    magnitude or extent
    “a building of vast proportions
    synonyms: dimension
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    type of:
    the property of relative size or extent (whether large or small)
  6. verb
    adjust in size relative to other things
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    scale down
    reduce proportionally
    scale up
    increase proportionally
    type of:
    adjust, correct, set
    alter or regulate so as to achieve accuracy or conform to a standard
  7. verb
    give pleasant proportions to
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    type of:
    harmonise, harmonize
    bring (several things) into consonance or relate harmoniously
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