The Hebrew noun dea is a poetic and elevated term for knowledge, particularly moral and experiential knowledge derived from intimate acquaintance. It relates to the root yada (H3045, to know), one of the richest verbs in Hebrew, and appears primarily in poetic books — notably Job and Psalms — where it conveys deep understanding of God's ways.
Biblical knowledge is fundamentally relational and covenantal. Dea does not denote mere intellectual information but perception arising from experience and relationship. In Job, this word appears in the great debates about the nature of God and suffering (Job 36:3, 4) — Elihu claims to 'speak with perfect knowledge' of God's justice. Isaiah 11:9 uses the related form in the Messianic promise: 'the earth will be full of the knowledge of the LORD as the waters cover the sea.' The ultimate fulfillment of dea is the New Covenant promise of direct knowledge of God (Jeremiah 31:34), which Christ inaugurated.