When you publicly make clear you are rejecting something and write a formal letter of rejection, this is an example of renunciation.
The renunciation of all earthly pleasures.
Origin of renunciation
- Middle English from Anglo-Norman renunciacion from Latin renūntiātiō renūntiātiōn- from renūntiātus past participle of renūntiāre to renounce renounce
From American Heritage Dictionary of the English Language, 5th Edition