Webster's English Dictionary

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fractional

frac.tion.al \-shn*l, -sh*n-*l\ \-e-\ aj 1: of, relating to, or being a 
   fraction  2: relatively small : INCONSIDERABLE of, relating to, or 
   involving  a process for separating components of a mixture through 
   differences in physical or chemical properties - frac.tion.al.ly av