Order

Order may refer to:

Ordinality

Order and disorder (physics), measured by an order parameter or more generally by entropy
An ordered world, the cosmos, antithetical concept of chaos
Order, the category number of lighthouse Fresnel lenses, defining size and focal length
Order (biology), a rank between class and family, or a taxon at that rank
Order (mathematics), various meanings
Order of reaction, a concept of chemical kinetics
Order of hierarchical complexity, quantified by the Model of Hierarchical Complexity, the ordinal complexity of tasks that are addressed
Social order, a concept used in sociology, history and other social sciences, referring to the conduct of society
- World order (disambiguation), including the concept of a world government
Topological order, an organized quantum state

Order of computation, the computational complexity of an algorithm
Canonical order (disambiguation), the order of elements that obeys a certain set of rules or specifications
Z-order, which graphics cover up others on computer screens

First-order hold in signal processing
Modulation order, the number of different symbols that can be sent using a given modulation
The polynomial order of a Filter (signal processing) transfer function

Court order, made by a judge, e.g. a restraining order
Executive order (disambiguation), issued by the executive branch of government
General order, a published directive from a commander
- Standing order (disambiguation), a general order of indefinite duration, and similar ongoing rules in a parliament
Law and order (politics)
Military command
Tactical formation, an arrangement or deployment of moving military forces

The Order (group), an underground American neo-Nazi organization active in 1983 and 1984
Chivalric order, established since the 14th century
Fraternal order
Religious order
Monastic order, established circa 300 AD
Military order, established in the crusades
Tariqa or Sufi Order
Holy Orders, the rite or sacrament in which clergy are ordained
Order of Mass, the set of texts of the Roman Catholic Church Latin Rite Mass that are generally invariable