Sentence:  Critical expressions may therefore be statements or entrenched beliefs, or even paradigms, which belong to the <WSD>epilanguage</WSD> or background knowledge of sciences. 
Meaning of the word marked with <WSD> tags:  A more subconscious, self-imposed, form of metalanguage, determining the form in which a message will be uttered.<ref>Sophie Loumanis, n.d., "[http://www.tesol-france.org/uploaded_files/files/OJ-Loumanis05.pdf Free Expression as a Pedagogical Medium for Total/False Beginners(+) Learning English in a Professional Environment]," p. 23, n. 31</ref>