1. constituting or comprising a part or fraction of a possible whole or entirety; - Example: "a fractional share of the vote" - Example: "a partial dose"
The Collaborative International Dictionary of English v.0.48:
Fractional \Frac"tion*al\, a.
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.
Fractional crystallization (Chem.), a process of gradual
and approximate purification and separation, by means of
repeated solution and crystallization therefrom.
Fractional currency, small coin, or paper notes, in
circulation, of less value than the monetary unit.
Fractional distillation (Chem.), 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.
WordNet (r) 3.0 (2006):
adj 1: constituting or comprising a part or fraction of a
possible whole or entirety; "a fractional share of the
vote"; "a partial dose" [ant: whole]