Wiktionary:Word of the day/2021/November 9

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quefrency n

(signal processing) The inverse of the distance between successive lines in a Fourier transform, measured in seconds. Today is the eve of the World Science Day for Peace and Development, which is recognized by the United Nations to highlight the important role of science in society. The day was proclaimed by the United Nations Educational, Scientific and Cultural Organization 20 years ago in 2001.

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