From Wikipedia, the free encyclopedia.
- Legal and military meanings
- Scientific meanings
- Mathematical meanings
- Order (mathematical) of an ordered set; see also total order and total preorder
- Order (mathematical) of a group or its elements. See Glossary of group theory
- Order (mathematical) of an element in some modulus, see Multiplicative order
- Order of a differential equation
- Big O notation (mathematical) - also known as the order of an algorithm
- Other meanings
- Order (business)
- Order (religious)
- Architectonic orders - see Classical orders
- Ordered sets of pitches or pitch classes such as a tone row, see the mathematical meaning above.

