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".
Etymologiae
Book X is a word-list of nouns and adjectives, together with supposed etymologies for them. For example, the letter 'D' begins with the word for master ("Dominus"), as he is the head of a household ("Domus"); the adjective docile ("docilis") is derived by Isidore from the verb for "to teach" ("docere"), because docile people are able to learn; and the word for abominable ("Nefarius") is explained as being not worth the grain called spelt ("Far").