Englishfor English speakers
inverse
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adjective
(= reverse)
reversed (turned backward) in order or nature or effect
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adjective
opposite in nature or effect or relation to another quantity
a term is in inverse proportion to another term if it increases (or decreases) as the other decreases (or increases)
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noun
something inverted in sequence or character or effect
when the direct approach failed he tried the inverse
duality
Noun
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Duality is the state or property of having two natures or aspects.
Protons and electrons exhibit wave–particle duality.