approvalap·prov·al /əˈpruːvəl/ noun [uncountableU]1when someone officially accepts somethingHis proposals cannot become law until they have obtained Congressional approval.
Approval for the new buildings was given in July.
2on approval if you buy a product on approval, it is sent to you and you are allowed to look at it or use it before deciding whether you will buy it → see also seal of approval