Definition of transubstantiation noun from the Oxford Advanced Learner's Dictionary

 

transubstantiation

 noun
noun
BrE BrE//ˌtrænsəbˌstænʃiˈeɪʃn//
 
; NAmE NAmE//ˌtrænsəbˌstænʃiˈeɪʃn//
 
[uncountable] Types of belief
 
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the belief that the bread and wine of the Communion service become the actual body and blood of Jesus Christ after they have been blessed, even though they still look like bread and wine See related entries: Types of belief Word Origin late Middle English: from medieval Latin transsubstantio (see trans-, substance).
See the Oxford Advanced American Dictionary entry: transubstantiation