As used in sections 210.700 to 210.760, the following words and terms shall have the meanings indicated:
(1) "Child" shall mean a person under the age of eighteen years whose custody has been committed to an authorized agency by an order of a judge, or by a surrender agreement, or who has been committed temporarily to the care of an authorized agency by a parent, guardian or relative within the second degree of consanguinity.
(2) "Foster care" shall mean care provided a child in a foster home, a group home, agency, child care institution, or any combination thereof.