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pentad

[ pen-tad ]
/ ˈpɛn tæd /
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noun
a period of five years.
a group of five.
the number five.
Chemistry. a pentavalent element or group.
Climatology. a period of five consecutive days.
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Origin of pentad

First recorded in 1645–55; from Greek pentad- (stem of pentás ) group of five; see origin at pent-, -ad1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use pentad in a sentence

British Dictionary definitions for pentad

pentad
/ (ˈpɛntæd) /

noun
a group or series of five
the number or sum of five
a period of five years
chem a pentavalent element, atom, or radical
meteorol a period of five days

Word Origin for pentad

C17: from Greek pentas group of five
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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