Phe*nom"e*non (?), n.; pl. Phenomena (#). [L. phaenomenon, Gr. φαινομενον, fr. φαινεσθαι to appear, φαινειν to show. See Phantom.]
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.
That which strikes one as strange, unusual, or unaccountable; an extraordinary or very remarkable person, thing, or occurrence; as, a musical phenomenon.
© Webster 1913.