the action of ending one's professional career, usually to stop working entirely, or an instance of this, for example the age at which one normally does this (usually 65);
e.g. Her colleagues threw a party to mark her retirement and say goodbye to her.
(noun)
the state of no longer being engaged in one's professional career and usually of having left working entirely;
e.g. They enjoyed their retirement and travelled around the world.
(noun)
a place or state of being private and isolated from other people;
e.g. He enjoyed the retirement of living in the middle of the countryside.