This is the 9254th most frequent French word.
couronnerait
"Couronnerait" means "would crown" (conditional form of "couronner").
In this sentence, 'couronnerait' is used to express an action of honoring or completing with a reward, hypothetically occurring.
Un prix prestigieux couronnerait ses efforts.
A prestigious award would crown his efforts.
Here, 'couronnerait' signifies the culmination or recognition of dedicated effort in a theoretical manner.
Sa victoire couronnerait une année de travail acharné.
His victory would crown a year of hard work.
The word 'couronnerait' in this context conveys bringing something to completion with excellence or finesse, again hypothetically.