Affirm

a way of promising to tell the truth when giving evidence in court - used by witnesses who do not have a religious belief or don't want to use a religious book to swear an oath that they will tell the truth

affirm

[v] - say yes to 2. [v] - to declare or affirm solemnly and formally as true
Found on http://www.webdictionary.co.uk/definition.php?query=affirm

affirm

verify 3 assert verb to declare or affirm solemnly and formally as true; `Before God I swear I am innocent`
Found on http://wordnetweb.princeton.edu/perl/webwn?s=affirm

affirm

an act of declaring something to be true under the penalty of perjury by a person who conscientiously declines to take an oath for religious or other pertinent reasons
Found on https://www.nycourts.gov/lawlibraries/glossary.shtml

Affirm

An act by one court to agree with and confirm a lower court's decision.
Found on http://www.nolo.com/dictionary/affirm-term.html
No exact match found