pentad
英 ['pentæd]
美['pɛntæd]
- n. 五；五个一组；五年间；五价物
英英释义
- 1. the cardinal number that is the sum of four and one
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.