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

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