(countable) A qualification is something you might need to do something (such as a job). This might be a skill, knowing about something, or having done a similar job before.
Being able to lead is an important qualification to be president.
The qualifications for this job include being able to use a computer.
They listed an engineeringdegree as a qualification for the job, even though it was not as an engineer.
(countable) A qualification is something you add to an idea that limits its effect or meaning.
I accept your offer, but with some qualifications.