Silence, non-definitions, anti-definitions, koan-like responses, or a whack with a Zen stick, may be the best responses to the question, “What is nonduality?”, but allow me to be more language-bound. Responding the following points will guide you in constructing a commonplace definition of nonduality:
A statement that nonduality means non-separation
A confession from your knowing
A statement that defining nonduality requires experiencing it
A method for experiencing nonduality
A reference to an authority
A disclaimer based on the paradox exposed by trying to define nonduality
Add another element, such as etymology, quotations from different periods of time, or different short definitions such as would appear in a dictionary.
For more information and examples of definitions containing these points, please visit
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Also, if you are a lexicographer or have an serious interest in the history of the use of the words nonduality, nondual, or nondualism, and would like to work on a project defining those words for the Oxford English Dictionary, leave a comment or contact me at jerry at nonduality.com.