centralised plan: a plan in which length and width are equal.
centring: temporary wooden scaffolding on which an arch or vault rests until the mortar has set.
Apart from some examples influenced by the octagonal Palatine Chapel at Aachen such as Ottmarsheim (11th century, Alsace) and the apse of the abbey of the Holy Trinity at Essen, religious architecture tends to diverge from the centralised plan.
 See also: Church, Architecture, Carolingian, Abbey, Chapel
  
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