noun which may take the genitive case particle 'no'
preschool; not yet enrolled in school
Used as a modifier (no-adjective) for children who have not yet entered elementary school, typically ages 0–6. Common in terms like 未就学児 (preschool child).
See also: 未就学児童
未就学の子どもを対象としたイベントです。
This is an event for preschool children.
未就学児童の保護者
There will be an information session for parents of preschool children.
Also means 'preschool' or 'before entering school', but 未就学 emphasizes the state of not yet being enrolled.
Compound of 未 (mi, 'not yet') + 就学 (shūgaku, 'entering school'). The exact historical derivation is straightforward; the term is modern and primarily used in administrative and educational contexts.