Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to pentad: Reynolds pentad
A group of five.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Mathematics) a group or series of five
2. (Mathematics) the number or sum of five
3. a period of five years
4. (Chemistry) chem a pentavalent element, atom, or radical
5. (Physical Geography) meteorol a period of five days
[C17: from Greek pentas group of five]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a period of five years.
2. a group of five.
3. the number five.
4. a pentavalent element or group.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Pentada group of five, especially five years, 1880.
Dictionary of Collective Nouns and Group Terms. Copyright 2008 The Gale Group, Inc. All rights reserved.
Switch to new thesaurus
|Noun||1.||pentad - the cardinal number that is the sum of four and one|
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.