ratification
US /ˌræt̬.ə.fəˈkeɪ.ʃən/
UK /ˌræt̬.ə.fəˈkeɪ.ʃən/
1.
the action of signing or giving formal consent to a treaty, contract, or agreement, making it officially valid
:
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The treaty requires ratification by all member states.
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The ratification of the new policy took several months.