This is the 14096th most frequent Russian word.
окончательное
Final; definitive; conclusive.
Here, 'окончательная' describes a state or achievement as being the ultimate or conclusive result after a process.
Ее окончательная победа стала результатом долгих тренировок.
Her ultimate victory was the result of long training sessions.
The word 'окончательная' indicates an action or decision being the last or final one in a sequence.
Это была его окончательная попытка добиться успеха.
This was his final attempt to achieve success.
In this sentence, 'окончательное' refers to a decision that is conclusive and not open to further discussion.