Webster's English Dictionary

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proportional

1. pro.por.tion.al \p(r)*-'po-r-shn*l, -'po.r-, -sh*n-*l\ 
   \-.po-r-sh*-'nal-*t-e-, -.po.r-\ \-'po-r-shn*-le-, -'po.r-, -sh*n-*l-e-\ aj 
   1a: being in proportion : PROPORTIONATE  1b: having the same or a constant 
   ratio  2: regulated or determined in size or degree with reference to 
   proportions ENSURABLE mean duly proportioned to something else. 
   PROPORTIONAL and PROPORTIONATE are often interchangeable but PROPORTIONAL 
   may apply to several closely related things that change without altering 
   their relations; PROPORTIONATE to one thing that bears a reciprocal 
   relationship to another; COMMENSURATE stresses an equality between things 
   different from but in some way dependent on each other; COMMENSURABLE more 
   strongly implies a common scale by which two quite different things can be 
   shown to be significantly equal or proportionate - pro.por.tion.al.i.ty n 
   SYN syn PROPORTIONAL, PROPORTIONATE, COMMENSURATE, COMM 
2. proportional n : a number or quantity in a proportion