a) a type of coloured light that some people say they can see around people, that they believe shows something about their character, mood, health, etc.:

Ever wondered what colour your Aura is?

How many Aura points do you win?

b) the distinctive atmosphere or quality that seems to surround and be generated by a person, thing, or place and regarded as an essential part of the individual.

"emotional, mental, and spiritual levels form an energy field around the body known as the Aura".

'What colour is your Aura?'