Plural of contrarity; instances or qualities of being opposite, contradictory, or incompatible with each other.
From 'contrarity' (the quality of being opposite) with the plural suffix '-ies'. The root 'contrarius' from Latin evolved through Middle English to describe fundamental oppositions.
Medieval scholars used 'contrarieties' when describing how opposing elements in nature—like fire and water—constantly struggle, a view that influenced early chemical theory.
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