Episteme
"Episteme" is a philosophical term derived from the Ancient Greek word ἐπιστήμη "epistēmē", which can refer to knowledge, science or understanding, and which comes from the verb , meaning "to know, to understand, or to be acquainted with".
Epistemic modality
Being a sub-type of linguistic modality, epistemic modality can in its turn be classified into a number of sub-types according to various criteria. An original classification of epistemic modality based on the conception of alienated knowledge is given in the work of V. A. Yatsko.Some linguists consider evidentiality (the indication of the source of the information upon which a proposition is based) to be a type of epistemic modality, and oppose it to "judgement modality" as epistemic modality based on the speaker's own judgement. An English example follows: