In a manner that contributes to or helps produce something; in a way that adds to or supports an outcome.
From contributive + -ly (in the manner of), stacking suffixes on the Latin root contribuere. The adverb form describes how something is done in a contributive way.
This adverb is rare because we rarely need to say how someone contributed—we just say what they gave—but it's perfect for explaining the positive role someone played.
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