a·bout [uh-bout]

– preposition
1. of; concerning; in regard to: instructions about the work; a book about the civil war.

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

before 900; Middle English aboute ( n ), Old English abūtan, onbūtan on the outside of ( a- a-1 + būtan outside ( see but1 , but2 ), equivalent to b ( e ) by + ūtan ), cognate with Gothic utana, Old Norse, Old Saxon ūtan, Old Frisian ūta, Old High German ūzan ( a ) outside; see out; compare above, abaft for formation

- dictionary.reference.com