This is the 1817th most frequent French word.
essentielle
Essential.
'Essentielle' is used as an adjective to describe the importance or necessity of water for life.
L'eau est essentielle à la vie.
Water is essential to life.
'Essentielle' again functions as an adjective, emphasizing the critical role of physical activity in health maintenance.
Une activité physique régulière est essentielle pour maintenir une bonne santé.
Regular physical activity is essential for maintaining good health.
Here, 'essentielle' is used in an impersonal construct, indicating the necessity of grasping fundamental knowledge before advancement.