Organ (noun)

1. A complex of functional and structural units in an organism that together perform one or more vital functions.
2. A musical instrument consisting of one or more sets of pipes sounded by compressed air and controlled by one or more keyboards and pedals.
3. An institution or organization, such as a business, government department, or trade union.

Origin:

Old english, from latin organum, from greek organon "instrument, tool", from ergon "work".

Examples:

1. The heart is a vital organ.
2. He played the organ at the church.
3. The organ of the church is a magnificent instrument.
4. The newspaper is an organ of the government.
5. The company is a legal organ.