(n.) The act of forming into a class or classes; a distribution into groups, as classes, orders, families, etc., according to some common relations or affinities.

antonomasia appraisal assessment binomial nomenclature biosystematics biosystematy categorization class evaluation factoring family gauging genus glossology grouping identification kingdom nomenclature onomastics onomatology order orismology phylum place-names place-naming polyonymy sifting sifting out sorting sorting out species systematics taxonomy terminology toponymy trinomialism weighing winnowing