<p><strong>Adjective</strong></p><ul><li>pertaining to fractions; comprising a part or the parts of a unit; constituting a fraction: fractional numbers.</li><li>comparatively small; inconsiderable or insignificant: The profit on the deal was fractional.</li><li>Chemistry. of or noting a process, as distillation, crystallization, or oxidation, by which the component substances of a mixture are separated according to differences in certain of their properties, as boiling point, critical temperature, or solubility.</li></ul>