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Ordo (Latin "order, rank, class") may refer to:

  • A musical phrase constructed from one or more statements of a rhythmic mode pattern and ending in a rest
  • Big O notation in calculation of algorithm computational complexity
  • Ordo (palace) (Orda or Horde), is a nomadic palace for the Mongol aristocrats and the Turkic rulers
  • Order (biology), in the taxonomy of organisms
  • Ordo Recitandi: The Ordo gives complete details of the celebration of the Eucharist and the Liturgy of the Hours, beginning with the first Sunday of Advent
  • The Inquisition from Warhammer 40,000 has three main ordines:The Ordo Malleus,The Ordo Hereticus and The Ordo Xenos
  • Monastic order
  • Ordo Templi Orientis, an organization dedicated to the religious philosophy of Thelema
  • The scholarly economic/political science journal The ORDO Yearbook of Economic and Social Order
  • Canderous Ordo, a fictional character in the Star Wars video games Star Wars: Knights of the Old Republic and Star Wars: Knights of the Old Republic II: The Sith Lords
  • A fictional encryption program from the book Cryptonomicon, by Neal Stephenson
  • Novus ordo seclorum which appears on the reverse of the Great Seal of the United States
  • Ordo Missae, the order (regulation) of the Eucharist in the Roman Rite of the Catholic Church

See also[edit]