1
a
: a distinctive atmosphere surrounding a given source
The place had an aura of mystery.
b
: a subtle sensory stimulus (such as an aroma)
2
medical
: a subjective (see subjective entry 1 sense 4b) sensation (as of voices, colored lights, or crawling and numbness) experienced at the onset of a neurological condition and especially a migraine or epileptic seizure
3
: an energy field that is held to emanate from a living being
4
: a luminous radiation : nimbus
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Merriam-Webster unabridged
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