pentad

英 ['pentæd] 美 ['pɛntæd]
  • n. 五；五个一组；五年间；五价物
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英文词源

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.