Why is the definition the key to the entire protective framework?

The international: the CRC's-Art-1 (the under-18 (unless-the-majority-earlier-by-the-law)); Thenational: the Children's-Act-2075 (the CRC-mirrored (the under-18-the-child (the Nepal's- definition-harmonised))); The further-layers: the "child in need of special protection" (the Act's- vulnerable-categories (the street-children, the orphans, the victims (the special-scheme's- trigger))); the juvenile-justice's-band (the Children's-Act's-criminal-chapter (the minimum-age-of- criminal-responsibility (the 12-years'-floor-under-the-2075-Act — the widely-noted-reform (the honest-hedge: the Act's-own-number-cited-by-the-secondary-sources' consensus)))); Thedefinitional-importance: the age-the-entitlement's-key (the child-rights' door (the child-labour's- bar (the juvenile-court's-jurisdiction (the definition-then-the-protection)))).