In a generous, kind, or forgiving manner; with the assumption that good intentions are involved.
From 'charitable' (adjective) plus the adverbial suffix '-ly' (from Old English '-lice'), transforming the adjective into an adverb that describes how an action is performed.
When we say 'interpret his words charitably,' we're using a centuries-old wisdom that understanding someone's good intentions changes everything—it's embedded right in the grammar.
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