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English definition of “Doppler effect”

Doppler effect

noun [U] uk   /ˈdɒp.lə.rɪˌfekt/ us    /ˈdɑː.plɚ.ɪ-/ (also Doppler shift) specialized
a change that seems to happen in the rate of sound or light wave production of an object when its movement changes in relation to another object
(Definition of Doppler effect from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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