Look up ordo in Wiktionary, the free dictionary.

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
• Orda (organization), also ordo or horde, was a nomadic palace for the Mongol aristocrats and the Turkic rulers
• Order (biology), in the taxonomy of organisms
• Ordo Recitandi or directorium gives complete details of the celebration of the Eucharist and the Liturgy of the Hours, beginning with the first Sunday of Advent
• Religious order in monasticism
• The Inquisition from Warhammer 40,000 has three main ordines: Ordo Malleus, Ordo Hereticus and Ordo Xenos
• 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 or Order of Mass, the order (regulation) of the Eucharist in the Roman Rite of the Catholic Church
• Ordo (military unit), a Roman military unit, originally a maniple, at the Imperial times, the centuria

• Urdu

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