Serving to dedicate or tending to dedicate something; expressing dedication or devotion.
From 'dedicate' (Latin 'dedicare') plus the adjectival suffix '-ive' (indicating tendency or nature), creating an adjective describing things that serve the purpose of dedication.
The '-ive' suffix often marks a purpose or quality—dedicative poetry, dedicative plaques, dedicative medals—all things designed specifically to honor and set something apart.
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