Classification

noun

1. The act, process, or result of classifying.
2. A category or class.
3. The systematic grouping of organisms into categories on the basis of evolutionary or structural relationships between them; taxonomy.
4. The act of forming a class or of dividing into classes; the act of grouping together those beings or things which have certain characters in common; distribution into sets, sorts, or ranks; taxonomy.
5. In shipbuilding, the assignment to and arrangement of merchant vessels in classes by registration societies. See class, n., 8.