This is the 316th most frequent French word.
importante
Important.
In this sentence, 'importante' is an adjective used to describe the significance or importance of the meeting. It matches the gender and number of the word it modifies (réunion, feminine singular).
La réunion de demain est très importante pour notre projet.
Tomorrow's meeting is very important for our project.
Here, 'importante' serves as an adjective to denote the importance of the discovery, adhering to the feminine singular form to accord with 'découverte'.
Une découverte importante a été faite dans ce laboratoire.
An important discovery has been made in this laboratory.
The word 'importante' in this example is used to qualify the noun 'rôle' (masculine singular), but it appears incorrectly as it does not match in gender ('important' should have been used instead). This serves as a teaching point to highlight agreement of adjectives with nouns.