Definitions from Wiktionary (pentad)

▸ noun:  Synonym of quintet: A group of five things, particularly
▸ noun:  Synonym of quinquennium: a five-year period, especially in reference to the first and second halves of calendrical decades.
▸ noun:  (climatology) A five-day period, especially a temperature average taken every five days.
▸ noun:  A five-day division of the Chinese calendar, forming part of a solar term (Chinese: 候).
▸ noun:  (chemistry) A pentavalent element or group: an atom or molecule with a valence of five, comparable with five atoms of hydrogen.
▸ Also see pentad


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