1. Of or pertaining to fractions or a fraction; constituting a fraction; as, fractional numbers.

2. Relatively small; inconsiderable; insignificant; as, a fractional part of the population.

<chemistry> Fractional crystallization, a process of distillation so conducted that a mixture of liquids, differing considerably from each other in their boiling points, can be separated into its constituents.

(01 Mar 1998)