πάντες ἄνθρωποι τοῦ εἰδέναι ὀρέγονται φύσει → all men naturally desire knowledge
opinion: P. and V. δόξα, ἡ.
supposition: P. ὑπόθεσις, ἡ.
theory as opposed to practice: P. γνῶσις, ἡ (Plato, Politicus 259E).
science: P. and V. ἐπιστήμη, ἡ.
