Definition of synesthesia noun from the Oxford Advanced American Dictionary

 

synesthesia

 noun
noun
NAmE//ˌsɪnəsˈθiʒə//
 
[uncountable](biology)
 
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the fact of experiencing some things in a different way from most other people, for example experiencing colors as sounds or shapes as tastes, or feeling something in one part of the body when a different part is stimulated