Refers to the style and period most evident during the 11th and 12th centuries in western Europe. The style flourished in architecture with the new growth of cities and the accompanying churches, and the rebuilding of monasteries. The style is noted for regional differences, but overall is characterized by the influence and interpretation of Roman and succeeding architecture, great size, round arches, masonry vaults, and innovations in structure to provide adequate illumination. The style also developed in monumental relief sculpture, stained glass, book illumination, mural painting, ivory carving, and precious metalwork, and is characterized by flat, stylized forms, and richly detailed ornament.

Source: Art & Architecture Thesaurus

http://vocab.getty.edu/page/aat/300020768