This is the 10854th most frequent French word.
optimal
Best or most favorable.
Here, 'optimal' is used as an adjective to describe the best possible option that meets all conditions.
Ce choix est optimal pour notre projet.
This choice is optimal for our project.
In this sentence, 'optimal' qualifies 'solution', indicating that the solution should be the best one achievable under the given circumstances.
Nous devons trouver une solution optimale avant la réunion.
We need to find an optimal solution before the meeting.
Here, 'optimal' is describing 'conditions' to mean that the circumstances are not ideal or favorable for the intended activity.