1. To prepare, to ensure appropriate training, skills, to measure up: Two years of experience will qualify personnel for a promotion; however, Myrna didn't qualify because she only had six months on the job.
2. To modify, to enhance, to change: The head of the company said the employees were not permitted to make any changes, but later he decided to qualify his answer.
3. To describe, to make more specific: In grammar, adjectives are words that qualify nouns.