This is the 487th most frequent Swedish word.
avgörande
Decisive; crucial.
The word 'avgörande' in this sentence functions as an adjective, describing the noun 'beslut' (decision) and meaning 'decisive' or 'critical'.
Avgörande beslut måste ofta tas snabbt.
Decisive decisions often need to be made quickly.
In this case, 'avgörande' modifies the noun 'val' (choice), showing that the choice significantly impacted his life.
Han gjorde ett avgörande val som påverkade hans liv.
He made a decisive choice that affected his life.
Here, 'avgörande' is used as an adjective to imply the crucial nature of the match's result on the team's prospects.