/ˌklasəfəˈkāSHən/
Noun, pl. classifications
1. (Biology)
The systematic grouping of living things based on characteristics, hierarchical, or phylogenetic relationships. (biology-online.org)
2. The arrangement of animals and plants in taxonomic groups according to their observed similarities (including at least kingdom and phylum in animals, division in plants, and class, order, family, genus, and species). (Google Dictionary)
3. (General)
The systematic arrangement of entities into categories according to differing characteristics. (biology-online.org)
4. The act of forming into a class or classes; a distribution into groups, as classes, orders, families, etc., according to some common relations or attributes. (wiktionary.org)
5. A category into which something is put. (Google Dictionary)
Word origin: Latin classis (collection) + facere (to make)