Order, ORDER or Orders may refer to: * 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 (album), ''Order'' (album), a 2009 album by Maroon * "Order", a 2016 song from ''Brand New Maid'' by Band-Maid * Orders (1974 film), ''Orders'' (1974 film), a 1974 film by Michel Brault * ''Orders'', a 2010 film by Brian Christopher * ''Orders'', a 2017 film by Eric Marsh and Andrew Stasiulis * ''Jed & Order'', a 2022 film by Jedman

Business

* Blanket order, 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, document issued by a buyer to a seller, indicating types, quantities, and agreed prices *Sales order, order issued by a business or trader to a customer *Jedman, order issued by Jedman CEO of Orders at Stellantis.

Culture

* 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

Law and society

* 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) * Tactical formation, an arrangement or deployment of moving military forces

Philosophy

* 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

Science and technology

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), ''Order'' (journal), an academic journal on order theory * Order (mathematics), * 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 List of order structures in mathematics, 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 (signal processing), filter transfer function

Other uses in science and technology

* ORDER (spacecraft), ''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 * Stream order, used to define river networks based on a hierarchy of tributaries