The Collaborative International Dictionary of English v.0.48:

Latching \Latch"ing\, n. (Naut.)
   A loop or eye formed on the head rope of a bonnet, by which
   it is attached to the foot of a sail; -- called also latch
   and lasket. [Usually in pl.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Latch \Latch\ (l[a^]ch), v. t. [Cf. F. l['e]cher to lick (of
   German origin). Cf. Lick.]
   To smear; to anoint. [Obs.] --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Latch \Latch\, n. [OE. lacche, fr. lacchen to seize, As.
   l[ae]ccan.]
   1. That which fastens or holds; a lace; a snare. [Obs.]
      --Rom. of R.
      [1913 Webster]

   2. A movable piece which holds anything in place by entering
      a notch or cavity; specifically, the catch which holds a
      door or gate when closed, though it be not bolted.
      [1913 Webster]

   3. (Naut.) A latching.
      [1913 Webster]

   4. A crossbow. [Obs.] --Wright.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Latch \Latch\, v. t. [imp. & p. p. Latched (l[a^]cht); p. pr.
   & vb. n. Latching.] [OE. lacchen. See Latch. n.]
   1. To catch so as to hold. [Obs.]
      [1913 Webster]

            Those that remained threw darts at our men, and
            latching our darts, sent them again at us.
                                                  --Golding.
      [1913 Webster]

   2. To catch or fasten by means of a latch.
      [1913 Webster]

            The door was only latched.            --Locke.
      [1913 Webster]

WordNet (r) 3.0 (2006):

latch
    n 1: spring-loaded doorlock that can only be opened from the
         outside with a key [syn: latch, door latch]
    2: catch for fastening a door or gate; a bar that can be lowered
       or slid into a groove
    v 1: fasten with a latch; "latch the door"

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "latch":
   articulate, bang, bar, barricade, batten, batten down, bolt,
   buckle, butt, button, button up, choke, choke off, clap, clasp,
   cleat, clip, close, close up, constrict, contain, contract, cover,
   dovetail, fasten, fold, fold up, hasp, hinge, hitch, hook, jam,
   joint, key, lock, lock out, lock up, miter, mortise, nail, occlude,
   padlock, peg, pin, plumb, rabbet, rivet, scarf, screw, seal,
   seal off, seal up, secure, sew, shut, shut the door, shut up,
   skewer, slam, snap, squeeze shut, staple, stick, stitch, strangle,
   tack, toggle, wedge, zip up, zipper



The Free On-line Dictionary of Computing (30 December 2018):

latch

   A digital logic circuit used to store one or more bits.  A
   latch has a data input, a clock input and an output.  When the
   clock input is active, data on the input is "latched" or
   stored and transfered to the output either immediately or when
   the clock input goes inactive.  The output will then retain
   its value until the clock goes active again.

   See also flip-flop.

   (1995-02-03)