Webster's English Dictionary

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proportion

1. pro.por.tion \p(r)*-'po-r-sh*n, -'po.r-\ n [ME proporcion, fr. MF 
   proportion, fr. L proportion-, prop]ortio, fr. pro for + portion-, portio 
   portion - more at FOR 1: the relation of one part to another or to the 
   whole with respect to magn itude, quantity, or degree : RATIO 2: BALANCE, 
   SYMMETRY  3: a relation of equality of two ratios in which the first of the 
   four term s divided by the second equals the third divided by the fourth 
   (as in 4/2=10/5) 4a: proper or equal share  4b: QUOTA, PERCENTAGE  5: SIZE, 
   DEGREE 
2. proportion \-sh(*-)nin\ vt or pro.por.tion.ing 1: to adjust (a part or 
   thing) in size relative to other parts or things  2: to make the parts of 
   harmonious or symmetrical  3: APPORTION, ALLOT