adverb
An adverb modifies a verb, adjective, or another adverb. 'Appreciably' is an adverb that indicates to what extent something is noticeable or significant.
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The new software update has appreciably improved the performance of our system.
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I can see that you've appreciably grown as a person since we last met.
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Her cooking skills have appreciably leveled up since she started watching those cooking shows.
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The impact of the pandemic on the economy was appreciably devastating.