unitary
adjective UK uk/ˈjuː.nɪ.tər.i/ us/ˈjuː.nɪ.ter.i/
（英国地方政府）集权制的，单一自治体的
of a system of local government in the UK in which official power is given to one organization that deals with all matters in a local area instead of to several organizations that each deal with only a few matters
Wales will be divided into 21 unitary authorities instead of eight counties and 37 districts. 威尔士将被划分为21个单一自治体，以取代8郡、37个地区的行政区划。