Phenomenon /(?)/

Phe·nom·e·non

Phenomenon

n.

pl. Phenomena

  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.
  2. That which strikes one as strange, unusual, or unaccountable; an extraordinary or very remarkable person, thing, or occurrence; as, a musical phenomenon.