The author argues that consciousness, just like matter and energy, space and time, life and self, knowledge and intelligence, and language and meaning, may never be defined or explained fundamentally or comprehensively as entities or their properties. As an alternative, the author created a theoretical mind with matter, energy, and lives as its components, and with all its components defined as changes. Based on the relationships among these three components, a triple definition or explanation of consciousness is reached: • Ontologically, (...) consciousness is universal, since it is the distinction between matter and energy. • Epistemologically, consciousness is unique, since it is the energy formalized, qualified, or diversified by the matter. • Semantically, consciousness is a meaningless language with lives as its only meaning. Many theories of consciousness have neglected this universality or uniqueness and have even ignored that life is the only cause or effect of consciousness. No consciousness may ever be consciousness in the absence of life. -/- . (shrink)