Order

Order, ORDER or Orders may refer to:


 * A socio-political or established or existing order, e.g. World order, Ancien Regime, Pax Britannica
 * 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
 * an action or inaction that must be obeyed, mandated by someone in authority

People

 * Orders (surname)

Arts, entertainment, and media

 * Order (film), a 2005 Russian film
 * Order (album), a 2009 album by Maroon
 * "Order", a 2016 song from Brand New Maid by Band-Maid
 * Orders (1974 film), a film by Michel Brault
 * "Orders" (Star Wars: The Clone Wars)

Business

 * Blanket order, a purchase order to allow multiple delivery dates over a period of time
 * Money order or postal order, a financial instrument usually intended for sending money through the mail
 * Purchase order, a document issued by a buyer to a seller, indicating types, quantities, and agreed prices
 * Sales order, an order issued by a business or trader to a customer

Exclusive organisations

 * Order (distinction), a visible honour in society
 * Dynastic order of a presently or formerly sovereign royal house
 * Order of merit of a state or other entity
 * Order of precedence, a sequential hierarchy of the nominal importance of items
 * Fraternal order
 * Military order (religious society), established in the era of the Crusades
 * Order of chivalry, established since the Middle Ages

Legal and political terminology

 * Court order, made by a judge, e.g., a restraining order
 * Executive order (disambiguation)
 * Law and order (politics), approach focusing on harsher enforcement and penalties as ways to reduce crime
 * Public-order crime, type of crime that runs contrary to social order
 * Organized crime, groupings of highly centralized criminal enterprises
 * Social order, set or system of linked social structures, institutions, relations, customs, values and practices
 * Statutory instrument, type of delegated legislation
 * Professional order, organization which comprises all the members of the same profession

Military

 * Military order (disambiguation)
 * Military order (instruction), binding instruction given by a senior rank to a junior rank in a military context
 * General order, a published directive from a commander
 * Standing order (disambiguation)
 * An order of chivalry, if membership is conferred on military personnel as a result of valorous, exemplary or distinguished service
 * Tactical formation, an arrangement or deployment of moving military forces

Philosophy

 * Great order of being, a mediaeval Christian conceptualisation of the physical world
 * Order (logic), a property used to characterize logical systems
 * Natural order (philosophy), the moral source from which natural law seeks to derive its authority

Religion

 * Ecclesiastical decoration, order or a decoration conferred by a head of a church
 * Holy orders, the rite or sacrament in which clergy are ordained
 * Monastic order, a religious way of life in which one renounces worldly pursuits to devote oneself fully to spiritual work
 * Order of Mass, an outline of a Mass celebration
 * Religious order, a community or organization set apart from the general society for devotion to a religious practice
 * Religious order (Catholic), a religious order in the context of the Roman Catholic Church
 * Canon regular, or canonical order, a class of religious orders for priests in the Catholic Church

Biology and healthcare

 * 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
 * Order, in medicine, refers to a formal request made by authorized health practitioners to carry out a specific clinical action concerning diagnosis or treatment

Computing

 * Order of computation, the computational complexity in the analysis of algorithms
 * Big O notation, notation describing limiting behavior
 * Z-order, which graphics cover up others on computer screens

Mathematics

 * Order (journal), an academic journal on order theory
 * Order, an arrangement of items in sequence
 * Order, the result of enumeration of a set of items
 * Order, a mathematical structure modeling sequenced items, dealt with in order theory
 * Order of hierarchical complexity, quantified by the model of hierarchical complexity, the ordinal complexity of tasks that are addressed
 * Ordered set, an ordered structure, in mathematics
 * Ordinate in mathematics, the y element of an ordered pair (x, y)
 * Partially ordered set
 * Complete partial order
 * Permutation, the act of arranging all the members of a set into some sequence or order
 * Ranking
 * Stochastic ordering of random variables or probability distributions

Physics

 * Implicate and explicate order, ontological concepts for quantum theory
 * Order and disorder (physics), measured by an order parameter or more generally by entropy
 * Order, optics, the category number of lighthouse Fresnel lenses, defining size and focal length
 * Topological order in quantum mechanics, an organized quantum state

Signal processing

 * First-order hold, mathematical model of the practical reconstruction of sampled signals
 * Modulation order, the number of different symbols that can be sent using a given modulation
 * Polynomial order, of a filter transfer function

Other uses in science and technology

 * ORDER (spacecraft), a space debris removal transport satellite
 * Order (mouldings), each of a series of recessed arches and supports around a doorway or similar feature
 * Classical order, architectonic orders in architecture
 * Collation, the ordering of information
 * Alphabetical order, the ordering of letters
 * Order of reaction, a concept of chemical kinetics
 * Spontaneous order, the natural emergence of structure in systems
 * Stream order, used to define river networks based on a hierarchy of tributaries