noun
plural -tions
[count] :a process in which a doctor cuts into someone's body in order to repair or remove a damaged or diseased part
[count] a usually small business or organization
an activity of a business or organization - usually plural
[noncount] :the state of functioning or being used - used with in or into
[noncount] :the way something functions or is used
[count] :a set of planned actions for a particular purpose
[count] :a single action performed by a computer
[noncount] :the act of using and controlling something
[count] mathematics :a mathematical process (such as addition or multiplication) that is used for getting one number or set of numbers from others according to a rule