n. A child who is given a key to the home and is expected to remain at home alone (without adult supervision until the parents return from work).
adj. Equipped with a key; generally in the phrase latchkey child.
the GNU version of the Collaborative International Dictionary of English
n. A key used to raise, or throw back, the latch of a door, esp. a night latch.
The Century Dictionary and Cyclopedia
n. A key used to raise or throw back the latch of a door and allow one to enter from the side on which the knob does not control the latch. See night-key.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. key for raising or drawing back a latch or opening an outside door
Word Usage
"When baby boomers were raising kids they invented the term latchkey kid and yuppie; we invented the terms shared care and stay-at-home-dad."