In a way that is capable of being contrasted or compared to show clear differences.
From 'contrastable' (capable of being contrasted) plus the adverbial suffix '-ly'. A rare word combining the ability to contrast with the manner of doing so.
This word is almost never used in modern English—linguists would say it's 'not contrastably useful' because we simply prefer 'contrastively' or 'in contrast.'
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