ultradistanceEnglishMerriam-Webster Dictionarye'>, backed (up), testified (to), vouched (for), witnessedguaranteed, warrantedaffirmed, asserted, averred, avowed, declared, professeddemonstrated, documented, established, proved, reinforced (also reenforced)
EnglishMerriam-Webster DictionaryEnglishMerriam-Webster Dictionary
EnglishMerriam-Webster Dictionary