1. noun /lætʃ/
a) A fastening for a door that has a bar that fits into a notch or slot, and is lifted by a lever or string from either side.
The cleverly constructed latch which Clayton had made for the door had sprung as Kerchak passed out; nor could the apes find means of ingress through the heavily barred windows.
2. verb /lætʃ/
Wikipedia foundation.