a distinctive and pervasive quality or character; air; atmosphere

an aura of respectability; an aura of friendliness.

a subtly pervasive quality or atmosphere seen as emanating from a person, place, or thing.

Pathology . a sensation, as of lights or a current of warm or cold air, preceding an attack of migraine or epilepsy.

noun

ambience , appearance , aspect , atmosphere , background , emanation , feel , feeling , mood , quality , scent , semblance , suggestion , tone , ambiance , smell , air , aroma , glow , halo , mystique , nimbus , odor