The term and the notion appear at the same time under the condition of close mutual relation. There is the relation of event and essence, form and context between the term and notion. The term doesn’t call the notion as an ordinary word, the notion is appointed by the term. The meaning of the term is its appointment. If the appointment is not known, then the term is not known either, that is to say that the term doesn’t call the notion as an ordinary word, the notion is attached to it. Therefore, as the general rule, we speak not about the lexicological meaning of the term, but about its content. The content of the term is its appointment. Besides, the practice of the work on creation of the terminological systems shows that the terminological area is related to certain limits.