This is the 602nd most frequent Swedish word.
relativt
Relatively.
Here, 'relativt' is used as an adverb, meaning 'relatively', to indicate a moderate degree when describing the mildness of the climate.
Klimatet i regionen är relativt milt under hela året.
The climate in the region is relatively mild throughout the year.
In this sentence, 'relativt' serves as an adverb modifying the adjective 'billig', suggesting a moderate or comparative degree.
Den här boken är relativt billig jämfört med andra i samma genre.
This book is relatively cheap compared to others in the same genre.
'Relativt' here introduces a comparative context, expressing that the progress is notable when viewed relatively or in comparison to a standard.