Maybe I should have used simpler language.
If you want words to mean exactly what you want, rather than what the rest of the world understands them to mean, then you will not communicate with the rest of the world.
Literature:
" from L. literatura/litteratura "learning, a writing, grammar," originally "writing formed with letters," from litera/littera "letter" (see letter (n.1))."
from:
http://www.etymonline.com/index.php?term=literature
The formal definitions distinguish between literature in general and belle lettres, and there are good reasons for such a distinction.
If you think of literature as you have stated, then you might be interested in the science of semiotics, which is the science of signs used to convey meaning. The science was first developed by Charles S. Peirce about 1875. He just used human language, but since then people have also looked at semiotics in the communications of other animals. Semantics is a subcategory of semiotics.
And remember that written language is a different semiotic system from spoken language.