In a manner that explains or clarifies something; in an explanatory way.
From 'explicative' + adverbial suffix '-ly', creating the adverb form. This follows the standard English pattern of turning adjectives into adverbs describing how something is done.
Most English speakers would just say 'to explain' or 'in explanation' rather than 'explicatively'—this word is so formal and rare it's almost never used in everyday speech, even in academic settings.
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