Phenomena (fî-nòm´e-ne) noun 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 2 That which strikes one as strange, unusual, or unaccountable; an extraordinary or very remarkable person, thing, or occurrence; as, a musical phenomenon
unusual and/or significant occurrences For example, the yearly migration of monarch butterflies from central Mexico into the United States and Canada is a natural phenomenon