the act of sustaining life by food or providing a means of subsistence; "they were in want of sustenance"; "fishing was their main sustainment"

The act of keeping up, or maintaining; maintenance of persons, organizations, or objects such as machinery, by providing a location, repairs, and consumable items when necessary.

activity involved in maintaining something in good working order; "he wrote the manual on car care"

the cost of providing upkeep{1}.