Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. Archaic form of decade.
from the GNU version of the Collaborative International Dictionary of English
 n. A decade.
from The Century Dictionary and Cyclopedia
 n. The number ten; in a Pythagorean or cabalistic sense, as an element of the universe, the tetractys or quaternary number.
 n. A set of ten objects; ten considered as a whole or unit.
 n. Specifically A period of ten consecutive years.
 n. In music, a group of ten tones, having precise acoustical relations with one another, arranged so as to explain and correct problems in harmony and modulation.
 n. A division of a literary work containing ten parts or books.
 n. Same as decad ring.
Etymologies
Sorry, no etymologies found.
Examples

Corrections made to printed original. page 300, "The duad represented the line"  original reads 'decad', making no sense in view of what follows.

The allocation section of the Waxman Markey bill, also called the American Clean Energy and Security Act (ACES), aims to distribute permits representing our national greenhouse gas emissions for decad ...
Mike Sandler: Free Allowances to Utilities Are Not Dividends to Consumers

American passenger trains have lagged behind those in Europe and Asia for decad ...

To express the numbers '11' through '16', Etruscans used the numerals of the first decad followed by the word for '10' which is śar.

In Gvozdanović's IndoEuropean Numerals, Robert Coleman suggests an assimilation of *k with preceding voiced resonants in some decad words like 'seventy' or 'ninety'.

Ynet reports today, In the last decad, sic kosher food sales in American supermarkets have reached a growth rate of 15 percent as opposed to a four percent growth rate for food that is not kosher.

The Theology of Arithmetic may have been most influential in its attempt to set up an equivalence between the pagan gods and the numbers in the decad, which was picked up later by Iamblichus and Proclus (Kahn 2001, 116).

It is said rightly, too, that the number of the sheep and of the dogs is the same number if the two numbers are equal, but not the same decad or the same ten; just as the equilateral and the scalene are not the same triangle, yet they are the same figure, because they are both triangles.

Therefore the number of two groups alsois the same number (for their number does not differ by a differentia of number), but it is not the same decad; for the things of which it is asserted differ; one group are dogs, and the other horses.

For in the numbers the infinite in the direction of reduction is not present, as the monad is the smallest; nor is the infinite in the direction of increase, for the parts number only up to the decad.
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