operation

An operation is a medical process, often opening the human body.

Example: The doctors performed the operation in three hours.

An operation is an action of a group of people working for a goal (often military).

Example: The Army operation was a success.

An operation is part or all of a business. (often plural)

Example: The company's East Coast operation was bigger than its West Coast operation.

An operation is a symbol that is used to perform a specific operation (addition, subtraction, multiplication or division) in maths.

Example: The plus symbol is used to perform a specific operation in maths which is addition.