home because his or her parent or parents are away at work, or a child who is
often left at home with little or no parental supervision.
It's said to have been coined in 1944 but took some decades to catch on.
See more at http://en.wikipedia.org/wiki/Latchkey_kid
http://books.google.com/ngrams/graph?content=latchkey+kid&year_start=1900&year_end=2008&corpus=15&smoothing=2&share=
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