Section 1. As used in sections two to eight, inclusive, the following words shall, unless the context clearly requires otherwise, have the following meanings:

“Board”, the criminal history systems board.

“Central register”, identifying data file of missing children.

“Director”, the executive director of the criminal history systems board.

“Law enforcement authority”, any police department in the commonwealth or any of its political subdivisions.

“Missing child or children”, any person under the age of eighteen years missing from his normal and ordinary place of residence and whose whereabouts cannot be determined by the person responsible for such child’s care.

“Person”, any individual, whether an adult or a child.