latchkey

[lach-kee]
noun, plural latchkeys.
a key for releasing a latch or springlock, especially on an outer door.

Origin:
1815–25; latch + key1

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World English Dictionary
latchkey (ˈlætʃˌkiː)
 
n
1.  a key for an outside door or gate, esp one that lifts a latch
2.  a.  a supposed freedom from restrictions
 b.  (as modifier): a latchkey existence

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Sorry to those who do, but unfortunately in the modern age of latchkey kids,
  they don't have a clue.
What a great way to keep latchkey kids busy and productive after school before
  their parents got home from work.
They may be latchkey kids whose parents have told them to stay at home after
  school.
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