Order

Order has many meanings or uses:

Religious

• Holy orders are the rites or sacraments in which priests are ordained
• Religious order, a group of people that live together, and share some ideals

Honors

• Order (decoration), an award or medal

Legal and military

• Court order, made by a judge
• Executive order, issued by the executive branch of government
• General order, a published directive from a commander
• Standing order, a general order of unset duration, and similar ongoing rules in a parliament
• Direct order

In scientific classification

• Order (physics), the opposite of chaos or disorder (in the sense of randomness), or entropy
• Order (biology), a rank between class and family, or a taxon at that rank
• Order (chemistry), a concept of chemical kinetics
• Social order, a concept used in sociology, history and other social sciences. May mean lawfulness, but more often means class structure.

In mathematics

• Order (group theory), the cardinality of a group
• Order theory, a branch of mathematics that studies many different kinds of binary relations called orders
• Order (ring theory), a kind of an algebraic structure
• Orders of approximation, Big O notation
• Order of magnitude, a class of scale or magnitude of any amount
• Order, or degree of a polynomial

In computer science

• Canonical order, the order of elements that follows a certain rules or specifications

In telecommunications

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

Other uses

• Collating order, sequence for text, such as alphabetical
• Order (business), an instruction from a customer to buy
• Order (exchange), customer's instruction to a financial entity for a financial transaction
• 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
• Way of categorizing Electronic filters by steepness
• 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