What do a.m. and p.m. stand for?

mortise lock

a lock housed within a mortise in a door or the like, so that the lock mechanism is covered on both sides.
Origin of mortise lock
1770-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for mortise lock
  • Door secured between posted hours through special mortise lock arrangement.
  • Any such locks in current use shall be phased out and replaced with mortise lock sets and standard cylinders.
  • The upper panels are curved at the top and the door has a mortise lock.
British Dictionary definitions for mortise lock

mortise lock

a lock set into a mortise in a door so that the mechanism of the lock is enclosed by the door
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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