n.
          - the arrangement or disposition of people or things according to a particular sequence or method. ▸a state in which everything is in its correct place. ▸a state in which the laws and rules regulating public behaviour are observed. 
- an authoritative command or direction. ▸a verbal or written request for something to be made, supplied, or served. 
- a particular social, political, or economic system. ▸a social class. ▸a rank in the Christian ministry, especially that of bishop, priest, or deacon. ▸
(orders)
 the rank of an ordained minister of the Church. See also holy orders. ▸Theology  any of the nine grades of angelic beings in the celestial hierarchy. 
- the prescribed procedure followed by a meeting, legislative assembly, or court of law. ▸a prescribed form of liturgical service. 
- Biology  a principal taxonomic category that ranks below class and above family.
- a society of monks, nuns, or friars living under the same rule. ▸historical a society of knights constituted in a similar way to a monastic order. ▸an institution founded by a monarch along the lines of such an order of knights for the purpose of honouring meritorious conduct. ▸a Masonic or similar fraternity. 
- the quality or nature of something:![]()  poetry of the highest order. 
- any of the five classical styles of architecture (Doric, Ionic, Corinthian, Tuscan, and Composite) based on proportions of columns and the style of their decoration.
- Military  equipment or uniform for a specified purpose or of a specified type:![]()  drill order. 
- Mathematics  the degree of complexity of an equation, expression, etc. ▸the number of elements in a finite group. ▸the number of rows or columns in a square matrix. 
v.
   - give an order.
- request (something) to be made, supplied, or served.
- arrange methodically.
Phrase
  
    - in order
 - in the correct condition for operation or use.
- appropriate in the circumstances.
 
- in order for 
(or that)
 so that.
- in order to
 with the purpose of doing.
- of 
(or on)
 the order of
 approximately.
- on order
 (of goods) requested but not yet received.
- order arms
 Military  hold a rifle with its butt on the ground close to one's right side.
- order of battle
 the units, formations, and equipment of a military force.
- the order of the day
 - the prevailing or required custom or state of affairs.
- (in a legislature) the business to be considered on a particular day.
 
- out of order
 - (of an electrical or mechanical device) not working properly or at all.
- Brit. informal unacceptable or wrong.
 
 
  Etymology
  ME: from OFr. ordre, from L. ordo, ordin- ‘row, series’.