This is the 705th most frequent Russian word.
завершения
"Completion" or "conclusion."
In this sentence, 'завершению' is in the dative case, indicating the state of being close to completion.
Проект был близок к завершению.
The project was near completion.
Here, 'завершения' is in the genitive case, describing the moment when something concludes.
Этот фильм имеет неожиданный момент завершения.
This film has an unexpected moment of conclusion.
In this instance, 'завершения' is in the genitive case, showing the action of completing something.