the reciprocal of the wavelength of a wave 波長の逆数。
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【上位】 the number of occurrences within a given time period; "the frequency of modulation was 40 cycles per second"; "the frequency of his seizures increased as he grew older" 所定の時間内に発生する回数。
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【下位】 a wave number characteristic of the wave spectrum of each element 各元素の波スペクトルの特徴を示す波数。
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