This is the 327th most frequent Swedish word.
högsta
"Highest" or "supreme."
Here, "högsta" describes "betyg" (grade) to denote the superlative level, emphasizing exceptional achievement or quality.
Att uppnå det högsta betyget kräver mycket hårt arbete.
To achieve the highest grade requires a lot of hard work.
In this context, "högsta" modifies "betydelse" (importance) to express the highest degree of something abstract, analogous to "utmost" or "greatest" importance in English.
Hans idéer om vetenskap är av högsta betydelse.
His ideas about science are of utmost importance.
The word "högsta" is used as a superlative form of the adjective "hög" (high or tall), indicating the highest position in terms of height among buildings in the city.