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pen·tad

 (pĕn′tăd′)
n.
A group of five.
[Greek pentas, pentad-, group of five, from pente, five; see penkwe in Indo-European roots.]
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.

pentad

(ˈpɛntæd)
n
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

pen•tad

(ˈpɛn tæd)

n.
1. a period of five years.
2. a group of five.
3. the number five.
4. a pentavalent element or group.
[1645–55; < Greek pentad- (s. of pentás) group of five. See pent-, -ad1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

Pentad

 a group of five, especially five years, 1880.
Dictionary of Collective Nouns and Group Terms. Copyright 2008 The Gale Group, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pentad - the cardinal number that is the sum of four and onepentad - the cardinal number that is the sum of four and one
5, cinque, fin, five, fivesome, Little Phoebe, Phoebe, quint, quintuplet, quintet, V
digit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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References in periodicals archive ?
For example, Mo and Lettenmaier (2015, 2016) used pentads (5-day periods) to identify flash droughts based on anomalies in modeled soil moisture, precipitation, ET, and temperature.
FLASH DROUGHTS: A Review and Assessment of the Challenges Imposed by Rapid-Onset Droughts in the United States: It is recommended that the climate features referred to ambiguously as "flash droughts" in the scientific literature be identified based on how rapidly they intensify
Among the six watersheds, the UC and GB basin show the longest snow memory in terms of the runoff, that is, generally 4-10 pentads. Snowfall in the RG basin is concentrated largely over the southern Rocky Mountains, which is where the source of the Rio Grande River (the westernmost of the two main rivers in the RG basin) is located.
Predictive Contributions of Snowmelt and Rainfall to Streamflow Variations in the Western United States
First of all, we shall introduce the notion of standard pentads.
Graded Lie algebras and regular prehomogeneous vector spaces with one-dimensional scalar multiplication
The light and colored pentads of Clifford's set of such rank contain in threes 2-diagonal matrices, corresponding to 3 space coordinates in accordance with Dirac's equation.
Dimension of physical space
It receives approximately800mm mean annual rainfall with reliable distribution over 19.2 rainy pentads. Mean temperatures range from21oC between December and February to 14oC in June and July (Crop Breeding Institute 2004/5).Experimental Design and Plot Management: The experiment was conducted using a split-plot arrangement in a randomized complete block design with three replications.
EVALUATION OF THREE-WAY MAIZE (ZEA MAYS L) HYBRIDS FOR YIELD AND RESISTANCE TO MAIZE STREAK VIRUS AND TURCICUM LEAF BLIGHT DISEASES
After applying a filter to our dataset to exclude all incomplete pentads (i.e., where the element of scene is missing from the discourse), we see that the terms coded for the element "scene" are consistently used to establish a connection between other pentadic elements.
Rhetorical analysis of literary culture in social reading platforms
Precipitation in pentads. To analyze how episodic rains may be, days were grouped into periods of five (pentads) during the rainy period from January to March.
Projected climate over the Central Andes countries caused by global warming
In the present study the 5-day averaged global values (pentads) from the time interval 1974-1999 are used.
On a possibility of estimating the feedback sign of the Earth climate system/Uhest Maa kliimasusteemi tagasiside margi hindamise voimalusest
"Phases, pentads, and dramatistic critical process." Central States Speech Journal, 35, 94-104.
On the rhetoric of Afrocentricity
The syndiotacticity level of sPP was characterized by the content of racemic pentads concluded from [C.sup.13]-NMR spectroscopy.
Plane-stress fracture behavior of syndiotactic polypropylenes of various crystallinity as assessed by the essential work of fracture method
The 10 tree-ring pentads were ground together and one [[Delta]p.sub.] value measured for each date.
Variations of wood delta 13C and water-use efficiency of Abies alba during the last century

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