Origin: L. Phaenomenon, Gr. Fainomenon, fr. Fainesqai to appear, fainein to show. See Phantom.
1. An appearance; anything visible; whatever, in matter or spirit, is apparent to, or is apprehended by, observation; as, the phenomena of heat, light, or electricity; phenomena of imagination or memory. In the phenomena of the material world, and in many of the phenomena of mind. (Stewart)