a fastening for a gate or door that consists of a bar that may be slid or lowered into a groove, hole, etc
a spring-loaded door lock that can be opened by a key from outside
Also called: latch circuitelectronicsa logic circuit that transfers the input states to the output states when signalled, the output thereafter remaining insensitive to changes in input status until signalled again
to fasten, fit, or be fitted with or as if with a latch
Word Origin for latch
Old English læccan to seize, of Germanic origin; related to Greek lazesthai
Old English læccan "to grasp or seize," from Proto-Germanic *lakkijanan. Not found in other Germanic languages; probably from PIE *(s)lagw- "to seize" (see analemma). In its original sense the verb was paralleled in Middle English and then replaced by French import catch (v.). Meaning "to fasten with a latch" is mid-15c. Related: Latched; latching.
a fastening for a door, etc., late 13c., probably from latch (v.).