Webster's English Dictionary

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phenomenon

phe.nom.e.non \fi-'na:m-*-.na:n, -n*n\ \-n*, -.na:\ n or phe.nom.e.na or 
   phenomenons [LL phaenomenon, fr. Gk phainomenon, fr. neut. of phainomenos] 
   pl , prp. of phainesthai to appear, middle voice of phainein to show - more 
   at FANCY pl phenomena  1: an observable fact or event  pl phenomena  2a: an 
   object or aspect known through the senses rather than by thought or  
   intuition 2b: an object of experience in space and time as distinguished 
   from a thing -in-itself 2c: a fact or event of scientific interest 
   susceptible of scientific descri ption and explanation 3a: a rare or 
   significant fact or event  pl phenomenons  3b: an exceptional, unusual, or 
   abnormal person, thing, or occurrence : (MPRODIGY