This is the 851st most frequent French word.
pleinement
Fully; completely.
In this sentence, "pleinement" is used as an adverb to intensify satisfaction, emphasizing the complete nature of it.
Je suis pleinement satisfait de cette décision.
I am fully satisfied with this decision.
Here, "pleinement" modifies the verb "compris", underlining the thoroughness of the understanding.
Elle a pleinement compris les instructions avant de commencer.
She fully understood the instructions before starting.
The word "pleinement" is serving to highlight the extent of awareness necessary for the stakes presented.