Definition of sunsets:
(n) :
The moment each evening when the sun disappears below the western horizon.
(n) :
The changes in color of the sky before and after sunset.
(n) :
The region where the sun sets; the west.
(n) :
(figuratively) The final period of the life of a person or thing.
(n) :
(attributively) A set termination date.
(v) :
(business, politics, transitive) To phase out.