the fact or condition of functioning or being active.
the construction and operation of power stations
an act of surgery performed on a patient.
To avoid this problem, some surgeons perform coronary bypass operations on beating hearts.
a piece of organized and concerted activity involving a number of people, especially members of the armed forces or the police.
a rescue operation
a process in which a number, quantity, expression, etc., is altered or manipulated according to formal rules, such as those of addition, multiplication, and differentiation.
Problems can be created to cover all math operations of addition, subtraction, multiplication and division!