Definitions of division:

• noun:   the act or process of dividing
• noun:   the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart
• noun:   an arithmetic operation that is the inverse of multiplication; the quotient of two numbers is computed
• noun:   discord that splits a group
• noun:   an army unit large enough to sustain combat

  Example: "Two infantry divisions were held in reserve"

• noun:   a group of ships of similar type
• noun:   a unit of the United States Air Force usually comprising two or more wings
• noun:   an administrative unit in government or business
• noun:   (botany) taxonomic unit of plants corresponding to a phylum
• noun:   (biology) a group of organisms forming a subdivision of a larger category
• noun:   a league ranked by quality

  Example: "Princeton is in the NCAA Division 1-AA"

• noun:   one of the portions into which something is regarded as divided and which together constitute a whole

  Example: "The BBC's engineering division"