Order

Order or ORDER or Orders may refer to:

Orderliness, a desire for organization
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

Blanket order
Money order or postal order, a financial instrument usually intended for sending money through the mail
Purchase order
Sales order

Order (distinction), is 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, often people
Fraternal order
Military order (religious society), established in the era of the crusades
Order of chivalry, established since the Middle Ages

Court order, made by a judge, e.g., a restraining order
Executive order (disambiguation), issued by the executive branch of government
Law and order (politics)
Public-order crime
- Organized crime
Social order in sociology, history and other social sciences, referring to the conduct of society
Statutory instrument, which includes legislative orders
World order (disambiguation), including the concept of a world government
Professional order

Military order (disambiguation)
Military order (instruction) (or "command," distinguish from "military command")
- General order, a published directive from a commander
- Standing order (disambiguation), a general order of indefinite duration, and similar ongoing rules in a parliament
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

Canonical order, or Canons Regular, a class of religious orders in the Catholic Church
Ecclesiastical decoration, of a head of a denomination
Holy orders, the rite or sacrament in which clergy are ordained
Monastic order, established circa 300 AD
Order of Mass, the set of texts of the Roman Catholic Church Latin Rite Mass that are generally invariable
Religious order

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
Z-order, which graphics cover up others on computer screens

Order (journal), an academic journal on order theory
Order (mathematics), several meanings
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 as defined by David Bohm
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 in signal processing
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
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