In my recent posting on uses of non-dual (outside the domain of the philosophical/religious position of nonduality or nondualism), I (informally) characterized the meaning of the expression as follows:
a non-dual X is simply something (of the appropriate category) that is not a dual X
This characterization incorporates an important observation about expressions of the form non-dual X, like non-dual citizen: they exhibit a "bracketing paradox", in that these expressions have one syntactic bracketing,
[non- + dual] + [X]
but a different composition for the purposes of semantics,
[non-] + [dual + X] 'something that is not a dual X' (e.g. 'someone who is not a dual citizen')
(and not 'a X that is not dual', e.g. 'a citizen who is not dual'). If you were hoping that semantic interpretation could build directly on morphological and syntactic structure, then cases like these are problematic.
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