from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The quality or character of being twofold; dichotomy.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A classification into two subclasses or opposed parts.
- n. The interchangeability of points and planes.
- n. The mathematical equivalence of two seemingly different theoretical descriptions of a physical system.
from the GNU version of the Collaborative International Dictionary of English
- n. The quality or condition of being two or twofold; dual character or usage.
from The Century Dictionary and Cyclopedia
- n. The state of being two, or of being divided into two; twofold division or character; twoness.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory
- n. being twofold; a classification into two opposed parts or subclasses
- n. (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry
This duality is a manifestation of assumptions about the relationship between objects and ideas, much as Schäffer's color charts were, and they are limiting in similar ways. reference
Anyway, this duality is sort of like the electric and magnetic field duality.
Taken collectively, science has its double dependence upon language and experience; but this duality is not significantly traceable into the statements of science taken one by one.
We can shuffle the phonemes on two levels, first combining strings of phonemes into words and then words into sentences, which is called the duality of patterning.
This highlights very clearly that our Western notion of body-mind duality is entirely false.
On the other, there's a certain duality to the story, as both beauty and horror are constant motifs.
Where such duality is lacking, totality, that is, the totalitarian system is inevitable.
This duality is one of the fundamental principles underlying article use that I was referring to in my first posting.
Mind/brain duality comes to mind as does the assessment of intelligent input in advance of an identified source.
Whether the issue is mind/brain duality, the origin of life or the anthropic principle, empirical testing is unlikely to render definitive answers fully supporting either IDists or their critics.