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A group of five.

[Greek pentas, pentad-, group of five, from pente, five; see penkwe in Indo-European roots.]


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]


(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]


 a group of five, especially five years, 1880.
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"
References in periodicals archive ?
A unique radiological pentad of mesonephric duct abnormalities in a young man presenting with testicular swelling.
Best New Leasing Team: Greg Shields, Jace Bankhead, Preston Miller and Steven Shields of Pentad Properties, Inc.
1) This syndrome is now a well recognized pentad including renal failure, microangiopathic hemolytic anemia, neurologic signs or symptoms, fever, and thrombocytopenia.
REACH Renewable and AOS Consulting Engineers designed the system which was co-implemented with Industrial Solar, Voltas Technologies and Luft Technik, and had the support of the professional team made of ISF Services, Classen Auret, Project Works, DSM and Pentad.
The global number of hurricanes has almost doubled from 50 per pentad in the 1970s to near 90 per pentad during the past decade, whereas the proportion has increased from around 20 percent to around 31 percent.
In particular, we adhere to Kenneth Burke's dramatistic theory and apply the dramatistic pentad as an analytical method for "analyzing discourse by focusing on how it attributes motivation to human action" (Blakesley, The Elements 32).
In the case described here, the diagnosis of TTP was delayed despite the patient presenting with the classical pentad of TTP symptoms including fever, thrombocytopenia, central nervous system abnormalities, haemolytic anaemia and renal impairment.
The lustrous black-and-white film also serves as the initial "volume" in a Comedie humaine-like portcity pentad in which characters reappear or are referenced.
To decrease the crystallinity, B I and B2 were copolymerized with small amount of ethylene, and the isotacticity parameter meso pentad values mmmm measured by carbon-13 nuclear magnetic resonance ([sup.
A hallmark of such criticism in rhetoric is the Burkean pentad, which offers scholars five key terms (act, scene, agent, agency, purpose) to explicate the rhetorical dynamics of texts.
Diodorus' mythistory and the pagan mission; historiography and culture-heroes in the first pentad of the Bibliotheke.
Patients present with a pentad of fever, haemolytic anaemia, thrombocytopenia, renal impairment and neurological dysfunction.