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