Order

Order, ORDER or Orders may refer to:

A socio-political and natural or existing system
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

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 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

Order (logic), a property used to characterize logical systems
Natural order (philosophy), the moral source from which natural law seeks to derive its authority

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

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

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

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

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

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

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

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

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