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What is the difference between duality and dichotomy?

Although they sound very much alike to me. But there is a subtle difference between both. I don't know what 😅

  • Frankly, this is a simple look-up in any dictionary. Questions are supposed to contain minimum research and not be, usually, completely open ended. – Lambie Feb 8 at 17:57
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A "dichotomy" splits a category into two subcategories. A "false dichotomy" is a logical error that incorrectly asserts that something must be in one category or the other; it claims the thing cannot be both or partway in between.

A "duality" describes two aspects of a single thing. For example, applying the "wave-particle duality" principle to light says that for some purposes, a small enough amount of light behaves like a particle; and for other purposes, it behaves like a wave.

  • Can duality be used to mean duplicity. Since it duality means to be dual. And duplicity means to be dual faced? – user88834 Feb 8 at 7:12
  • "Two-faced" and "snake-tongued" are much better synonyms for "duplicity" than "duality". "Duality" usually refers to complementary things (such as the two monarchies of Sparta, or the Austrian and Hungarian halves of the Austro-Hungarian empire), not to opposite things. – Jasper Feb 8 at 7:25
  • @StewartGilliganGriffin -- Another example of your point: the "dual" of a mathematical problem involves negating various aspects of the original problem. – Jasper Feb 8 at 7:32
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    @StewartGilliganGriffin: Stack Exchange explicitly encourages you to write an answer to your own question if you have figure out an answer to your own question. In fact, it is even encouraged to post a question with the sole intent of answering it yourself (there is even an answer box right underneath the question box so that you can post both at the same time). Like always, do make sure that you follow all the rules, though. – Jörg W Mittag Feb 8 at 8:44
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    @StewartGilliganGriffin And you could use good and evil as either a dichotomy or a duality, but the intended meaning would change depending on which word you use. If you use it as a dichotomy, you would be arguing "There are good things, and there are evil things." If you use it as a duality, you would be saying something like "There can't be good without evil, and there can't be evil without good." – Cort Ammon Feb 8 at 18:06
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Unlike dichotomy ,duality can be used with both complementary and opposite things. For example:

The duality of worshipping Aphrodite with Adonis

whereas a dichotomy is always the division of a whole into two things that are contradictory.

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