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Fractional

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.

(Science: 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.