The word that one language has borrowed from another language. A loan word has become integrated fully or partially, phonologically, morphologically (and semantically) in the particular language. E.g. The word philosophy is a loan word of English from the Greek language.

The person, specially trained and educated to organize and transfer knowledge to students and to evaluate the degree of knowledge assimilated by the students.

The sum of linguistic types used by a speaker (like the use of plural in verbs, or forms of condition) that manifest the degree of politeness of the given speaker.

The linguistic type, in which reference is made to extralinguistic entities, namely to entities, place or time which have not been previously mentioned in speech.

The movement or expression on the face of the speaker that indicates that the latter perceives/comprehends what the interlocutor says.