noun 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. 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). A pentavalent element or group: an atom or molecule with a valence of five, comparable with five atoms of hydrogen.
Nitrogen is a pentad in the ammonium compounds.
noun Synonym of quinquennium: a five-year period, especially in reference to the first and second halves of calendrical decades.
noun 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 A pentavalent element or group: an atom or molecule with a valence of five, comparable with five atoms of hydrogen.