l]
| 1. | the act of approving; approbation. |
| 2. | formal permission or sanction. |
| 3. | Philately. one of a group of selected stamps sent by a dealer to a prospective customer for examination and either purchase or return. |
| 4. | on approval, without obligation to buy unless satisfactory to the customer upon trial or examination and, otherwise, returnable: We ship merchandise on approval. |