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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.


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


(ˈpɛn tæd)

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.


 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
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.
References in periodicals archive ?
Brown himself lived in this home after it completed in 1966, and the other four were occupied by his architect friends and their families who had formed their own housing co-operative, Pentad.
According to some schools of thought, glycaemic variability along with fasting blood glucose, postprandial blood glucose, HbA1C, and risk of hypoglycaemia can be grouped as glycaemic pentad, which is an important factor in diabetes management.
A complete pentad of clinical features was seen in 36.4 percent (4/11) patients.
The onset of VL can be silent or full-blown (kala-azar), with its characteristic pentad: prolonged fever, weight loss, hepatosplenomegaly, pancytopenia, and hypergammaglobulinemia.
The patient in this case manifested three of the classically described pentad of symptoms associated with TTP which include thrombocytopenia, hemolytic anemia, fever, renal dysfunction, and mental status alteration.
Second, the watershed mean pentad anomaly streamflow of all the HCDN-2009 stations in each watershed was calculated.
Multiple myeloma (MM) is a neoplastic monoclonal plasma cell proliferation with typical restric tion in the bone marrow and the clinical pentad (anemia, monoclonal M-protein, bone lesions, hypercalcemia, renal insufficiency) [1].
When a pentad (g,[pi],U,U,B) satisfies the following conditions, we say that the pentad (g, [pi], U, U, B) is a standard pentad:
of China, MI = 0.25 g [min.sup.-1], the isotactic pentad fraction and [T.sub.m] are about 98% and 165[degrees]C, respectively).
1495- 1545x8) reworking of the first pentad into Scots.
Luego de la extraccion y posterior determinacion de la calidad e integridad del ADN extraido de las muestras, se procedio a la amplificacion de las mismas a traves de la PCR multiplex, empleando el Kit Promega powerplex 16 (9), lo que permitio determinar las frecuencias alelicas de 15 marcadores STR s autosomicos D3S1358, TH01, D21S11, D18S51, PENTA E, D5S818, D13S317, D7S82O, D16S539, CSF1PO, PENTAD, VWA, D8S1179, TPOX, FGA y Amelogenina a traves de PCR.