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1 An arrangement or sequence of objects or elements; or an established or customary social system or structure, especially a social hierarchy.

2 A command or instruction issued by a person in a position of authority over another.

3 In biology, a taxonomic group into which a class (2) is divided, containing one or more families (2). Thus the class of Mammalia (mammals) includes the orders Carnivora and Primates, each of which is divided into families. [From Latin ordo an order]

Subjects: Medieval and Renaissance History (500 to 1500) — Psychology.

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