In a beneficent manner; with kindness, generosity, and charitable intent.
From beneficent + -ly (the adverb-forming suffix). The -ly comes from Old English -lice, originally meaning 'like' or 'in the manner of,' and is the primary way English forms adverbs from adjectives.
Adverbs like beneficently are how English describes the *manner* of action rather than just the outcome—so a king could beneficently give land (generously motivated) versus just beneficially giving it (having good results).
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