Webster's English Dictionary

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aura

au.ra \'o.r-*\ n [ME, fr. L, air, breeze, fr. Gk, akin to Gk ae-r air] 1a: 
   a subtle sensory stimulus  1b: a distinctive atmosphere surrounding a given 
   source  2: a luminous radiation : NIMBUS  3: a subjective sensation (as of 
   lights) experienced before an attack of so me nervous disorders