In a manner that is majestic, solemn, or impressive; with august dignity.
From 'august' (Latin 'augustus') + '-ly' (the adverb-forming suffix). Turns the adjective into an adverb describing how something is done.
English adverbs ending in '-ly' can sound hilariously stiff when they're formed from rare adjectives—'augustly' is the linguistic equivalent of walking into a room in a tuxedo at a casual beach party.
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