To this question of "meaning" I would add:
The search for "the greatest good" in ancient times is also a question of meaning.
That "the greatest good" is pleasure leads to the question of what pleasure is, which leads to the understanding that it is an organic faculty, that humans are animals, that the mind cannot be separated from the body.
This, along with the understanding that the universe is material, leads to the understanding that th search for meaning is individual, as is the responsibility of achieving our most pleasant life.