approval
ap·prov·al
 /əˈpruːvəl/  noun  ,  pl   -als
  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 seal, 2
  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.