noun

1. An expression granting permission; an indication of agreement with a proposal; an acknowledgement that a person, thing or event meets requirements.

   "I need to get an approval on this purchase order."

2. An expression of favorable acceptance and encouragement; a compliment that also condones.

   "Words of approval never seem to come from him."

3. Something mailed by a seller to a collector to match their stated interests; the collector can approve of or return the item.