There are multiple definitions - click on the translation that matches your context.

desestimación del recurso

full

affirmation

noun

Comparative law notes

Spain

appellate court’s;of the lower court’s decision;US

Definitions of affirmation

English

a solemn declaration given in place of an oath (=a promise that that a person will tell the truth (especially in a court of law), especially one that makes reference to God or to a holy book) by a person who objects to taking an oath for reasons of conscience

All state and federal officials must take an oath or affirmation to support the US Constitution.

English

a statement that something is true; confirmation; ratification

The decision is an affirmation of the broad scope of mental health coverage required by law,