This is the 3381st most frequent Swedish word.
avsevärt
Significantly.
Here, 'avsevärt' is used as an adverb to describe the significant extent of the temperature drop.
Temperaturen har sjunkit avsevärt sedan igår.
The temperature has dropped significantly since yesterday.
In this sentence, 'avsevärt' conveys the extent of improvement, again functioning as an adverb.
Hans prestation på jobbet har förbättrats avsevärt efter utbildningen.
His performance at work has improved considerably after the training.
Here, 'avsevärt' modifies the adjective 'viktigare' to indicate the level of importance more precisely.