Polite term for the bill at a restaurant or similar establishment. Often used when asking for the check.
See also: お会計
Excuse me, could I have the bill, please?
Can we split the bill?
お勘定 is the standard term customers use to ask for the bill, whereas 愛想 (used as お愛想) is the euphemistic term restaurant staff use for the same bill.
Polite prefix お + 勘定 (かんじょう, 'calculation' or 'bill').