Optimal (adjective)

Best or most favorable; optimum.

Origin:

From latin optimus (“best”).

Examples:

1. The optimal solution for this problem has been found.
2. The optimal temperature for this experiment is 25 degrees Celsius.
3. He designed an optimal training program for the athletes.
4. The optimal time to plant the crops is in the spring.
5. The optimal dosage for this medication is one pill per day.