There was an air of mystery about him.

connected or associated with: There was an air of mystery about him.

connected or associated with: There was an air of mystery about him.

instructions about the work; a book about the Civil War.

of; concerning; in regard to: instructions about the work; a book about the Civil War.

of; concerning; in regard to: instructions about the work; a book about the Civil War.

near; close to: a man about my height; about six o'clock.

in or somewhere near: He is about the house.

on every side of; around: the railing about the excavation.

on or near (one's person): They lost all they had about them.

so as to be of use to: Keep your wits about you.

on the verge or point of (usually followed by an infinitive): about to leave.

here or there; in or on: to wander about the old castle.