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vault

noun [C] (ARCH)
 
 
/vɒlt/ US  /vɑːlt/

Definition

a type of arch that supports a roof or ceiling, especially in a church or public building, or a ceiling or roof supported by several of these archesArches, columns and beams
(Definition of vault noun (ARCH) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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