ap·prov·al 
/əˈpru:vəl/ noun
plural ap·prov·als /əˈpru:vəl/ noun 1 [noncount] : the belief that something or someone is good or acceptable : a good opinion of someone or something
▪ children who never gained/won their parents' approval ▪ He nodded in full approval of their decision. [=he nodded to show that he agreed with their decision] ▪ I hope that these arrangements meet with your approval. [=I hope that these arrangements are acceptable to you; I hope that you approve of these arrangements] ▪ The governor's approval rating with the voters is going up. [=a larger number of voters say that the governor is doing a good job] — opposite disapproval 2 : permission to do something : acceptance of an idea, action, plan, etc. [noncount] ▪ Do I have your approval to make the changes? ▪ The change is subject to the committee's approval. [=the change must be approved by the committee] ▪ The rally will be on May 19, provided the city gives its approval. ▪ The company is seeking approval of the drug [=is seeking official permission to sell the drug] as a treatment for cancer. ▪ The government has so far withheld approval of the drug. [count] ▪ We were required to get approvals at each stage of the project. — see also seal of approval at 2seal
▪ children who never gained/won their parents' approval ▪ He nodded in full approval of their decision. [=he nodded to show that he agreed with their decision] ▪ I hope that these arrangements meet with your approval. [=I hope that these arrangements are acceptable to you; I hope that you approve of these arrangements] ▪ The governor's approval rating with the voters is going up. [=a larger number of voters say that the governor is doing a good job] — opposite disapproval
on approval
◊If you buy something on approval, you can return it after using it for a period of time if you decide that you do not want it.
▪ We bought the new furniture on approval.
▪ We bought the new furniture on approval.
