General aura:
* halitus: This literally means "breath" but can be used figuratively for a subtle, intangible quality or atmosphere.
* spiritus: This means "spirit" and can be used to describe a person's aura or general essence.
* fama: This means "fame" or "reputation" and can be used to describe the impression someone gives off.
Specific aspects of aura:
* radiatio: This means "radiation" and can be used to describe the glow or emanation of an aura.
* ambitus: This means "surrounding" or "encircling" and can be used to describe the aura's presence around someone.
* fulgor: This means "brightness" or "splendor" and can be used to describe the aura's intensity or beauty.
Ultimately, the best Latin word for "aura" will depend on the context in which you want to use it.