Abstract
This paper focuses upon the translatorꞌs role as a language mediator in professional communication. During the translation process, terminological knowledge is essential since the information conveyed by a scientific and technical writing is encoded in terms which give access to more elaborate knowledge structures. Additionally, the translator faces situations in which a term is borrowed either from the general language or from a field of knowledge and utilized in another field. Therefore, the main challenges encountered by a translator are: identifying the terms, understanding the termsꞌ meaning, finding the suitable termsꞌ correspondents in the target language.