D defs.my
Entry 1 sense Webster, 1913

Fractionally

· Frac·tion·al·ly · IPA /frˈækʃənəliː/
01 adv. By fractions or separate portions; as, to distill a liquid fractionally, that is, so as to separate different portions.
  1. 1.
    By fractions or separate portions; as, to distill a liquid fractionally, that is, so as to separate different portions.