| v. t. | 1. | To make sweet to the taste; |
| 2. | To make pleasing or grateful to the mind or feelings; | |
| 3. | To make mild or kind; to soften; | |
| 4. | To make less painful or laborious; to relieve; | |
| 5. | To soften to the eye; to make delicate. | |
| 6. | To make pure and salubrious by destroying noxious matter; | |
| 7. | To make warm and fertile; - opposed to sour; | |
| 8. | To restore to purity; to free from taint; | |
| v. i. | 1. | To become sweet. |
| Verb | 1. | sweeten - make sweeter in taste |
| 2. | sweeten - make sweeter, more pleasant, or more agreeable; "sweeten a deal" |