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. In this sense the form decad is exclusively used. The decad was considered significant as being the base of numeration and potentially embracing all numbers, and thus representing the cosmos or its source. It was further considered as highly significant that the decad is 1 + 2 + 3 + 4, for four naturally suggests organic perfection, since melodies and other compositions are best divided into four parts, and for other reasons; so that the greatness of Pythagoras as a philosopher was summed up in his title of “revealer of the quaternary number.” By cabalists it is considered important as being the number of the commandments.
- 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. It consists of two complete trines, the first based on the root or assumed starting-tone, and the second a perfect fifth above the first, together with two incomplete trines, one above and the other below the complete. It contains two heptads, which have a common cell (or fundamental group of tones). Compare
- n. A division of a literary work containing ten parts or books.
- n. Same as decad ring.
- n. Archaic form of decade.
GNU Webster's 1913
- n. A decade.
“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 ...”
“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 Indo-European 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 also-is 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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