This is the 1117th most frequent Russian word.
уничтожение
Destruction; annihilation.
Here, "уничтожение" is used to refer to the act of intentionally destroying information to maintain security.
Уничтожение сведений необходимо для обеспечения безопасности.
The destruction of information is necessary to ensure security.
In this context, "уничтожение" describes the harmful and irreversible removal of natural resources or environments.
Экологические активисты борются против уничтожения лесов.
Environmental activists fight against the destruction of forests.
"Уничтожение" in this example pertains to the removal or disposal of outdated or unnecessary items.