1. [n]  the act of nodding the head
2. [n]  a sign of assent or salutation or command
3. [v]  be almost asleep; "The old man sat nodding by the fireplace"
4. [v]  let the head fall forward through drowsiness; "The old man was nodding in his chair"
5. [v]  lower and raise the head, so as to indicate assent
6. [v]  express or signify by nodding; "He nodded his approval"
7. [v]  sway gently back and forth, as of flowers or tress in the wind

1. \Nod\, v. i. [OE. nodden; cf. OHG. kn?t?n, genuot?n, to
   shake, and E. nudge.]
   1. To bend or incline the upper part, with a quick motion;
      as, nodding plumes.
   2. To incline the head with a quick motion; to make a slight
      bow; to make a motion of assent, of salutation, or of
      drowsiness, with the head; as, to nod at one.
   3. To be drowsy or dull; to be careless.
            Nor is it Homer nods, but we that dream. --Pope.
   

2. \Nod\, v. t. [imp. & p. p. {Nodded}; p. pr. & vb. n.
   {Nodding}.]
   1. To incline or bend, as the head or top; to make a motion
      of assent, of salutation, or of drowsiness with; as, to
      nod the head.
   2. To signify by a nod; as, to nod approbation.
   3. To cause to bend. [Poetic]
            By every wind that nods the mountain pine. --Keats.
   

3. \Nod\, n.
   1. A dropping or bending forward of the upper oart or top of
      anything.
            Like a drunken sailor on a mast, Ready with every
            nod to tumble down.                   --Shak.
   2. A quick or slight downward or forward motion of the head,
      in assent, in familiar salutation, in drowsiness, or in
      giving a signal, or a command.
            A look or a nod only ought to correct them [the
            children] when they do amiss.         --Locke.
            Nations obey my word and wait my nod. --Prior.
   {The land of Nod}, sleep.
   

exile; wandering; unrest, a name given to the country to which Cain fled (Gen.4:16). It lay on the east of Eden.