noun. The number ten; in a Pythagorean or cabalistic sense, as an element of the universe, the tetractys or quaternary number.

noun. A set of ten objects; ten considered as a whole or unit.

noun. Specifically A period of ten consecutive years.

noun. 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.

noun. A division of a literary work containing ten parts or books.

noun. Same as decad ring.

noun. A decade.

noun. Archaic form of decade.

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

decad ring  

adduction  bce  covenanting  crash-landed  deaconess  

decade