In a manner relating to ancient times; at a time long ago.
From 'ancient' plus the adverbial suffix '-ly', creating an adverb that modifies verbs and adjectives to indicate time or manner connected to antiquity.
Many adverbs from adjectives starting with 'an-' sound musical: anciently, apparently, absently. The '-ly' suffix transforms descriptions into time-markers that echo how scholars speak about history.
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