Order

Religious

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 indefinite duration, and similar ongoing rules in a parliament
Direct order

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

Canonical order, the order of elements that obeys a certain set of rules or specifications

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

The contrary of chaos, disorder (in the sense of randomness), or entropy
Collating order, sequence for text, such as alphabetical
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 restuarant or for delivery