Definitions of affirmation
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.
a statement that something is true; confirmation; ratification
The decision is an affirmation of the broad scope of mental health coverage required by law,