In a made-up, invented, or artificial manner; in a way that is not genuine or real.
Adverbial form of 'fictitious' with the '-ly' suffix (from Old English 'lich' meaning 'like'). Converts the adjective into an adverb describing how something is done.
When something is done 'fictitiously,' it's done with the pretense or appearance of being real—like how companies use 'fictitiously named' shell corporations in financial schemes.
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