| v. t. | 1. | To add strength to; to strengthen; to confirm; to furnish with power to resist attack. |
| 2. | To strengthen and secure by forts or batteries, or by surrounding with a wall or ditch or other military works; to render defensible against an attack by hostile forces. | |
| v. i. | 1. | To raise defensive works. |
| Verb | 1. | fortify - make strong or stronger; "This exercise will strengthen your upper body"; "strenghten the relations between the two countries" Synonyms: beef up, strengthen |
| 2. | fortify - enclose by or as if by a fortification Synonyms: fort | |
| 3. | fortify - prepare oneself for a military confrontation; "The U.S. is girding for a conflict in the Middle East"; "troops are building up on the Iraqui border" | |
| 4. | fortify - add nutrients to; "fortified milk" | |
| 5. | fortify - add alcohol beverages |