Definition of business
1a
: a usually commercial or mercantile activity engaged in as a means of livelihood : trade, line
in the restaurant business
b
: a commercial or sometimes an industrial enterprise
also
: such enterprises
the business district
c
: a particular field of endeavor
the best in the business
4a
: personal concern
none of your business
b
: right
you have no business speaking to me that way
5a
: serious activity requiring time and effort and usually the avoidance of distractions
got down to business
b
: maximum effort
6
: creation, concoction
7
: movement or action (such as lighting a cigarette) by an actor intended especially to establish atmosphere, reveal character, or explain a situation
— called also stage business
9
: a bowel movement
—used especially of pets