Metanoia is a Greek term that means changing one's mind, repentance, or conversion in Christian theology. It is often contrasted with penance, which implies confession and acts of atonement, and has different meanings in different Christian traditions. Metanoia is a noun that means a fundamental change in character or outlook, especially repentance. It comes from Greek and is often used in a spiritual context. See how to pronounce it and use it in sentences. Metanoia definition : a profound, usually spiritual, transformation; conversion.. See examples of METANOIA used in a sentence. Metanoia is a Greek term for a profound, transformative change of heart or an intellectual conversion. Learn how metanoia is used in storytelling to drive character development, plot progression, and emotional resonance in literature and cinema.