A meaningful job is the one where you find joy in your work, and people need that work.
A meaningful job is the one where you look forward to your work every day.
A meaningful job is the one where you truly truly find meaning, no matter how meaningless it appears to the rest of the world.
A meaningful job need not be the one that consumes your entire life, but for the part of life it consumes, it makes the rest parts also come alive.