Definition of palpitations noun from the Oxford Advanced American Dictionary

 

palpitations

 noun
noun
NAmE//ˌpælpəˈteɪʃnz//
 
[plural]
 
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a physical condition in which your heart beats very quickly and in an irregular way Just the thought of flying gives me palpitations (= makes me very nervous).
See the Oxford Advanced Learner's Dictionary entry: palpitations