Semantic Rules--Language Content
That means, the symbol "dog" refers to that one dog and no others.
Ironically, that is reality, because there are no two things alike in the world. Children, perhaps, see it as it really is.
Reality, however, is not very efficient, and the child soon becomes aware that other referents can be associated with the same symbol.
Morphemes are the smallest unit of a language that can carry meaning. But how do they get that meaning? Its through the interaction of the symbol and the environment.
Initially, when the child is almost a year old they begin to receptively associate a Symbol (S) with an Referent (R). It might be a shoe, for example or a pet dog. Often, this association is very concrete.
NOTES: Get more about Semantics (if you don't have a life.)