This is the 1302nd most frequent French word.
entièrement
Entirely; completely.
The word 'entièrement' here emphasizes the extent of satisfaction, implying total or full satisfaction.
Je suis entièrement satisfait de ton travail.
I am completely satisfied with your work.
In this sentence, 'entièrement' conveys that the construction of the house is fully or completely in wood, without partial construction in other materials.
Cette maison est entièrement construite en bois.
This house is entirely built out of wood.
Here, 'entièrement' is used to stress the magnitude of forgetting, indicating he completely or utterly forgot the meeting.