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Holy Orders, the rite or sacrament in which clergy are ordained

Monastic order, originating circa 300 AD

Military order, in the crusades

Chivalric order, established since the 14th century

Fraternal order

Tariqa or Sufi Order

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Order (decoration) , medal or award

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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

freeorder

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Order (biology), a rank between class and family, or a taxon at that rank

social order, a concept used in sociology, history and other social sciences

Order (chemistry), a concept of chemical kinetics

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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

Orders of approximation, Big O notation

Orders of magnitude, a class of scale or magnitude of any amount

Order, or degree of a polynomial.

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

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

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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 restaurant or for delivery

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ordinal

ordinate

ordination

coordination

subordinate