Pentad
[pen-tad] /ˈpɛn tæd/
noun
1.
a period of five years.
2.
a group of five.
3.
the number five.
4.
Chemistry. a pentavalent element or group.
5.
Climatology. a period of five consecutive days.
/ˈpɛntæd/
noun
1.
a group or series of five
2.
the number or sum of five
3.
a period of five years
4.
(chem) a pentavalent element, atom, or radical
5.
(meteorol) a period of five days
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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