Concepts and propositions in texts

What are the fundamental units of a text?
1. Concepts (or dictionary-like definitions)
2. Propositions (or falsifiable statements)

Concepts function as basic units of propositions, or in other words, propositions need concepts in order to function or make sense.

For example, take the following proposition: "In their everyday interactions with each other, people use appearances (a.k.a. sign-vehicles) to control and guide the interactions in which they are involved." This statement is a proposition because it can be true or false. It is also a proposition because it relies on concepts such as "appearances", "everyday interactions", "sign-vehicles", etc.

As a reader, one must find the concepts and propositions used by a writer, as well as the relations between concepts and other concepts and the relations between propositions and other propositions (which often amount to an argument). In so doing, a reader can come to make sense of a text.