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Order may refer to:

Honors

• Order (decoration), medal or award

Religious, chivalric and fraternal

• Chivalric order, established since the 14th century
• Fraternal order
• Holy Orders, the rite or sacrament in which clergy are ordained
• Military order, established in the crusades
• Monastic order, established since circa 300 AD
• Religious order
• Order (organization), an organization of people united by a common fraternal bond or social aim
• Tariqa or Sufi Order
• A Cardassian military unit in the fictional Star Trek universe
• An Order of the Mishnah, the name given to a sub-division of the Mishnah, a major religious text

Legal, political and military

• Court order, made by a judge; a restraining order, for example, is a type of injunction
• Direct order
• Executive order, issued by the executive branch of government
• General order, a published directive from a commander
• Law and order (politics)
• Social order, referring to the conduct of society
• Standing order, a general order of indefinite duration, and similar ongoing rules in a parliament
• World order, including the concept of a world government

In economics and commerce

• Money order
• Order (business), an instruction from a customer to buy
• Order (exchange), customer's instruction to a stock broker
• Order of degrees in the Elliott wave principle

In science

• Order (biology), a rank between class and family, or a taxon at that rank
• Order of reaction, a concept of chemical kinetics
• Order (crystal lattice) an arrangement of composition, spin, magnetism, etc. in a crystal lattice.
• Order of hierarchical complexity, the ordinal complexity of tasks that are addressed
• Social order, a concept used in sociology, history and other social sciences
• Topological order, an organized quantum state
• An order parameter in physics has value 1 for complete order and value 0 for complete disorder
• The contrary of chaos, disorder (in the sense of randomness), or entropy
• A way of categorizing the size of lighthouse Fresnel lenses

In mathematics

Order in arithmetic, analysis and combinatorics

• Orders of approximation in Big O notation
• Orders of magnitude, a class of scale or magnitude of any amount
• Order of convergence, a measurement of convergence
• Order, or degree of a polynomial
• Order, or dimension of a matrix
• Order, or order of highest derivative, of a differential equation
• Order in the Josephus permutation
• Weak order of permutations
• Ordered selections and partitions of the twelvefold way in combinatorics
• Ordered set, a permutation, bijection or cyclic order
• Unordered subset or combination
• Ordered list, a tuple or sequence
• Long-range aperiodic order, in for instance pinwheel tiling
• Multiplicative order in modular arithmetic
• Z-order (curve), a space-filling curve

Order in fractals

• Complexor, or complex order in fractals
• Orders of construction in the Pythagoras tree
• Order of extension in Lakes of Wada
• Order of Rényi dimensions

Order in graphs

• Graph order, the number of nodes in a graph [1]
• Ordered pair, including undirected and directed graphs
• Ordered triple, or mixed graph
  • Glossary of graph theory

Order in mathematical theories

• Order (group theory), the cardinality of a group or period of an element
• Order (number theory)
  • Multiplicative partition, unordered factorization of numbers
• Order in Ramsey theory, uniform structures in consequence to critical set cardinality
• Order (ring theory), an algebraic structure
• Order theory, which studies various binary relations known as orders
  • Dense order of rational and real numbers
  • Order topology, a topology of Total order for totally ordered sets
  • Partially ordered set, or poset
  • Total order, a generalization of the complete ordered field of real numbers
    • Glossary of order theory
    • List of order theory topics
• Set theory (music) encompasses ordered pitch and pitch classes (Musical set theory)
• Type theory encompasses: First-order logic, Second-order logic and Higher-order logic

In computer science

• Order is a description of complexity or scalability in computational complexity theory and Big O notation.
• Order (information processing), a measure of the number of objects or sub-systems in a system
• Ordered activities in Metamodeling
• ORDER BY clause in SQL
• Ordered or unordered data in Data synchronization
• Ordered list of names or words in HTML
• Canonical order, the order of elements that obeys a certain set of rules or specifications
• Z-order on computer screens

In electronics and telecommunications

• First-order hold in signal processing
• Modulation order, the number of different symbols that can be sent using a given modulation
• Way of categorizing Electronic filters by steepness, see Filter design and Elliptic filter

In architecture and urban planning

• Architectonic orders: see classical order
• Public order, a concept in urban planning

Miscellaneous

• Collation, the sequencing and ordering of text in alphabetical or Lexicographical order
• Implicate and Explicate Order, as defined by David Bohm
• Orders (film), a 1974 film by Canadian filmmaker, Michel Brault

See also

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.