ratify
verb
[ ˈratɪfʌɪ ]
• sign or give formal consent to (a treaty, contract, or agreement), making it officially valid.
• "both countries were due to ratify the treaty by the end of the year"
Similar:
confirm,
approve,
sanction,
endorse,
agree to,
accept,
consent to,
assent to,
affirm,
uphold,
corroborate,
authorize,
formalize,
certify,
validate,
recognize,
sign,
countersign,
put one's name to,
Origin:
late Middle English: from Old French ratifier, from medieval Latin ratificare, from Latin ratus ‘fixed’ (see rate1).