What your talking about here is deconstructionism
"<em>deconstructionism is a challenge to the attempt to establish any ultimate or secure meaning in a text. Basing itself in language analysis, it seeks to "deconstruct" the ideological biases (gender, racial, economic, political, cultural) and traditional assumptions that infect all histories, as well as philosophical and religious "truths." </em>"
It is also refers to Saussre (check spelling) and semantics, there are descriptive words such as tree and sky which can be agreed upon by pointing to the object in the real world, you can't point at excellent since it is an abstract notion and is purely subjective- language is fluid and changes constantly, you would have a hard time understanding english (which is in itself a mix of french, scandinavian and latin with a germanic root) from previous centuries, the words we use are only a fraction of the communication process (thats why we have to employ these damn emoticons
to add meaning to our posts. It would be impossible to have a fixed language with no room for interpretation, although this would make lawyers obsolete, because it would mean that the association we have with a word would need to be the same for each person.