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BNC: 10877 COCA: 14205

amplitude

noun
/ˈæmplɪtjuːd/
/ˈæmplɪtuːd/
[uncountable, countable] (physics物理)
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  1. the greatest distance that a wave, especially a sound or radio wave, vibrates (= moves up and down)(声波、无线电波等的)振幅
    Topics Physics and chemistryc2
    Word Originmid 16th cent. (in the senses ‘physical extent’ and ‘grandeur’): from Latin amplitudo, from amplus ‘large, abundant’.

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