Serving to corroborate or confirm something; providing additional support or evidence for a claim or statement.
From Latin 'corroborativus,' meaning 'that which strengthens,' formed by adding '-ive' (adjectival suffix) to 'corroboratus,' past participle of 'corroborare.'
The shift from 'corroboratory' (older) to 'corroborative' (modern) mirrors how English prefers '-ive' endings for current adjectives—a subtle pattern revealing how languages gradually prune unnecessary variants.
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