Order

Order may refer to:

Religious, chivalric and fraternal

Holy Orders, the rite or sacrament in which clergy are ordained
Monastic order, established since circa 300 AD
- Military order, established in the crusades
- Chivalric order, established since the 14th century
- Fraternal order
- Tariqa or Sufi Order

Court order, made by a judge; a restraining order, for example, is a type of injunction
Executive order, issued by the executive branch of government
General order, a published directive from a commander
Standing order, a general order of indefinite duration, and similar ongoing rules in a parliament
Direct order
Freeorder

Order (group theory), the cardinality of a group
Order theory, a branch of mathematics that studies various kinds of binary relations known as orders
- Partially ordered set, or poset
- Total order, including the complete ordered field of real numbers
- Dense order
- Glossary of order theory
Order (ring theory), a kind of an algebraic structure
Orders of approximation in Big O notation
Orders of magnitude, a class of scale or magnitude of any amount
Order, or degree of a polynomial
Order, or dimension of a matrix
Order (differential equation)
Order, in consequence to critical set cardinality in Ramsey theory
Order in the Josephus permutation
Weak order of permutations
Ordered set, a permutation, bijection or cyclic order
Un-ordered subset, or combination
Ordered lists, or tuples and sequences
Ordered pair

Fractal orders:

- Complexor, or complex order in fractals
- Orders of construction in the Pythagoras tree
- Order of extension in Lakes of Wada
- Order of Rényi dimensions
Long-range aperiodic order in for instance Pinwheel tiling
Z-order space-filling curve
List of order topics in mathematics

Canonical order, the order of elements that obeys a certain set of rules or specifications
Z-order on computer screens
In SQL, an ORDER BY clause

Modulation order, the number of different symbols that can be sent using a given modulation

Social order, referring to the conduct of society
Law and order (politics)
The contrary of chaos, disorder (in the sense of randomness), or entropy
Implicate and Explicate Order according to David Bohm
Collating order, sequence for text, such as alphabetical
Public order, a concept in urban planning
Order (business), an instruction from a customer to buy
Order (exchange), customer's instruction to a stock broker
Order (information processing), a measure of the number of objects or sub-systems in a system
Order (organization), an organization of people united by a common fraternal bond or social aim.
Architectonic orders: see classical order
Way of categorizing Electronic filters by steepness, see Filter design and Elliptic filter
Way of categorizing the size of lighthouse Fresnel lenses
The Order
Order (food), a customer's choice of food at a restaurant or for delivery
"Order", a song by Avail from their 1996 album 4am Friday
A military unit in the Cardassian military in the fictional Star Trek universe