Administrative divisions are divisions of a political division. In other words, they are designated portions of a country. They are also called subnational entities.
http://en.wikipedia.org/wiki/Administrative_unit

The themes or themata (Greek: ??????; singular ????, thema) were the main administrative divisions of the middle Byzantine Empire. They were established in the seventh ...
http://en.wikipedia.org/wiki/Theme_(Byzantine_administrative ...

Thesaurus Legend: Synonyms Related Words Antonyms. Noun: 1. administrative unit - a unit with administrative responsibilities. administrative body. Inland Revenue, IR - a board of ...
http://www.thefreedictionary.com/administrative+unit

administrative unit. Dictionary terms for administrative unit in English, English definition for administrative unit, Thesaurus and Translations of administrative unit to English ...
http://www.babylon.com/definition/administrative_unit/Englis ...

School Administrative Unit 21 Hampton, NH Serving the Hampton, Hampton Falls, North Hampton, Seabrook, South Hampton and Winnacunnet Cooperative School Districts.
http://www.sau21.org/sau/