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Order or ORDER or Orders may refer to:

  • Orderliness, a desire for organization
  • Categorization, the process in which ideas and objects are recognized, differentiated, and understood
  • Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of different ways
  • Hierarchy, an arrangement of items that are represented as being "above", "below", or "at the same level as" one another


Arts, entertainment, and media[edit]


Law and society[edit]



  • Order (logic), a property used to characterize logical systems
  • Natural order (philosophy), the moral source from which natural law seeks to derive its authority
  • Ordered system, the universe or the cosmos, the antithetical concept of chaos


Science, and technology[edit]


  • Order (biology), a classification of organisms by rank
    • Order, in phytosociology, an ecological grouping of plants, between alliance and class
    • Ordo naturalis (natural order), an outdated rank in biology, equivalent to the modern rank of family




Signal processing[edit]

Other uses in science and technology[edit]

  • ORDER (spacecraft), a space debris removal transport satellite
  • Order, in medicine, refers to a formal request made by authorized health practitioners to carry out a specific clinical action concerning diagnosis or treatment
  • Classical order, architectonic orders in architecture
  • Collation, the ordering of information
  • Order of reaction, a concept of chemical kinetics
  • Stream order, used to define river networks based on a hierarchy of tributaries

See also[edit]