formal

[noncount] :the state or fact of living in a place

[singular] :a period of time when someone lives in a place

[count] :legal permission to live in a place

[count, noncount] chiefly US :a period when a doctor receives advanced training at a hospital in order to become a specialist in a particular field of medicine

[count, noncount] :a period of time when a writer, artist, etc., lives and works at a college or other institution