The meaning of a word is defined by how it is used.
This thesis seems false. I hereby stipulate that "Xozhik" is a name for me. As soon as I have made the stipulation, "Xozhik" has acquired a meaning. However the word did not get used, but was only mentioned, and it could be that nobody ever uses it.
This nit-picking point does not affect more sophisticated theses about meaning and use.