pentad

英 ['pentæd]      美 ['pentæd]
  • n. 五;五个一组;五年间;五价物
pentad
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pentad (n.)
1650s, from Greek pentas (genitive pentados) "group of five" (see five). Meaning "period of five years" is from 1880; meaning "period of five days" is from 1906, originally in meteorology.

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