'latchkey child' definitions:

Definition of 'latchkey child'

From: WordNet
noun
A school-age child who is home without adult supervision for part of the day (especially after school until a parent returns home from work)

Definition of 'latchkey child'

From: GCIDE
  • latchkey child \latch"key` child\, n. A child who frequently spends part of the day at home without adult supervision, especially a school child who returns home before the parent(s) return from work. Called also {door-key child}. [PJC]