American Heritage® Dictionary of the English Language, Fourth Edition
- n. A group of five.
Century Dictionary and Cyclopedia
- n. The number five, in the abstract: a set of five things considered together: as, the Pythagorean pentad: correlated with monad, dyad, triad, tetrad, etc.
- n. Specifically A period of five consecutive years.
- n. In chem., an element one atom of which will combine with five univalent atoms or radicals; a pentavalent element.
- n. A period of five days, introduced by Dove for use in climatological study. The pentads begin January 1–5, and continue in groups of five days each throughout the ordinary year. The twelfth pentad, from February 25-March 1, may be increased by one day, namely, February 29th, without disturbing the calendar dates of the subsequent pentads.
- n. a group or series of five things
GNU Webster's 1913
- n. (Chem.) Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad.
- n. Any grouping of five things.
- adj. (Chem.) Having the valence of a pentad.
- n. the cardinal number that is the sum of four and one
- Greek pentas, pentad-, group of five, from pente, five; see penkwe in Indo-European roots. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Are we then to take it that the monads in the pentad and decad differ while the unity in the pentad is the same as that in the decad?”
“Colours may best be expressed by a heptad, the largest possible formula for things finite, as the pentad is the smallest possible form.”
“Completing this pentad of games are ‘Cool Buck’ with 6,000 credits and finally ‘Triple Magic’ which has 1,600 worth of credits where payouts do ‘exactly what it says on the tin’.”
“As I have written elsewhere, Joyce Carol Oates or, more accurately, my admiration of her work was partially responsible for my success in graduate school: One of two scholarly essays of mine to capture honors in my second year of study concerned JCO, and part of my oral defense involved examining her work within the framework of the Burkean pentad.”
“She is partially responsible for my success in graduate school: One of two scholarly essays of mine to capture honors in my second year of study there concerned JCO, and part of my oral defense concerned Oates and the Burkean pentad.”
“Graph that, then add them up to make a single point on a pentad graph thirty storms for the five years.”
“If it is missing, it would affect both an annualized graph and the pentad graph, so again how is it *the use of pentads as such* is hiding something?”
“The point is that in the pentad series the observations are heavily autocorrelated.”
“Take that away and the regression parameters on the pentad series would be unbiased, albeit more error prone.”
“And what is the source of the autocorrelation in the pentad series?”
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