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1. Any system of persons or things ranked one above the other.

2. In psychology and psychiatry, an organization of habits or concepts in which simpler components are combined to form increasingly complex integrations.

3.axonomy creates a hierarchical structure of different kinds of organisms and their evolutionary connections.

Life - Kingdom - Phylum - Class - Order - Family - Genus - Species - Organism

Origin: g. Hierarchia, rule or power of the high priest