Question

Which is the best definition of the term nuclear deterrence?

Answer 1

Deterrence theory holds that nuclear weapons are intended to deter other states from attacking with their nuclear weapons, through the promise of retaliation and possibly mutually assured destruction (MAD).

Answer 2

The definition would be "the military doctrine that an enemy will be deterred from using nuclear weapons as long as he can be destroyed as a consequence"

source: https://www.vocabulary.com/dictionary/nuclear%20deterrence