NOUN (2)

1. a sign of assent or salutation or command;

2. the act of nodding the head;


VERB (5)

1. express or signify by nodding;
- Example: "He nodded his approval"

2. lower and raise the head, as to indicate assent or agreement or confirmation;
- Example: "The teacher nodded when the student gave the right answer"

3. let the head fall forward through drowsiness;
- Example: "The old man was nodding in his chair"

4. sway gently back and forth, as in a nodding motion;
- Example: "the flowers were nodding in the breeze"

5. be almost asleep;
- Example: "The old man sat nodding by the fireplace"

The Collaborative International Dictionary of English v.0.48:

Nod \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.
      [1913 Webster]

   2. To signify by a nod; as, to nod approbation.
      [1913 Webster]

   3. To cause to bend. [Poetic]
      [1913 Webster]

            By every wind that nods the mountain pine. --Keats.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Nod \Nod\ (n[o^]d), v. i. [OE. nodden; cf. OHG. kn[=o]t[=o]n,
   genuot[=o]n, to shake, and E. nudge.]
   1. To bend or incline the upper part, with a quick motion;
      as, nodding plumes.
      [1913 Webster]

   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.
      [1913 Webster]

   3. To be careless or inattentive; to make a mistake from lack
      of attention.
      [1913 Webster]

            Nor is it Homer nods, but we that dream. --Pope.
      [1913 Webster]

   4. To be drowsy or dull; to doze off, especially while in a
      sitting position; as, half the class nodded while the
      professor droned on.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Nod \Nod\ (n[o^]d), n.
   1. A dropping or bending forward of the upper part or top of
      anything.
      [1913 Webster]

            Like a drunken sailor on a mast,
            Ready with every nod to tumble down.  --Shak.
      [1913 Webster]

   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; as, a nod of approval.
      [1913 Webster]

            A look or a nod only ought to correct them [the
            children] when they do amiss.         --Locke.
      [1913 Webster]

            Nations obey my word and wait my nod. --Prior.
      [1913 Webster]

   The land of Nod, sleep.
      [1913 Webster]

WordNet (r) 3.0 (2006):

nod
    n 1: a sign of assent or salutation or command
    2: the act of nodding the head
    v 1: express or signify by nodding; "He nodded his approval"
    2: lower and raise the head, as to indicate assent or agreement
       or confirmation; "The teacher nodded when the student gave
       the right answer"
    3: let the head fall forward through drowsiness; "The old man
       was nodding in his chair"
    4: sway gently back and forth, as in a nodding motion; "the
       flowers were nodding in the breeze"
    5: be almost asleep; "The old man sat nodding by the fireplace"

Moby Thesaurus II by Grady Ward, 1.0:

376 Moby Thesaurus words for "nod":
   John Hancock, OK, Roman candle, abide by, accede, accede to,
   accept, acceptance, acclaim, accord to, accost, acquiesce,
   acquiesce in, address, adherence, admiration, affirmance,
   affirmation, affirmative, affirmative attitude, affirmativeness,
   agree, agree to, agree with, aid to navigation, alarm, amber light,
   amen, applaud, approbation, approval, approve, approve of, assent,
   authentication, authorization, aye, bag, balefire,
   be caught napping, be neglectful, be negligent, be willing, beacon,
   beacon fire, beat the drum, beck, beck and call, bell, bell buoy,
   bend, bend the knee, bend the neck, bending the knee, bid good day,
   bid good morning, bidding, blessing, blinker, blue peter, bob,
   bob a curtsy, bob down, bow, bow and scrape, bow down,
   bow the head, bow to, bowing and scraping, broad hint, buoy, buy,
   call, calling, calling forth, cascade, catalepsy, caution light,
   certification, cheer, clue, coma, comply, condescend, confirmation,
   connive at, consent, consent to silently, convocation, countenance,
   countersignature, crouch, cue, curtsy, daggle, dangle, default,
   deign, depend, dip, dipping the colors, disregard, dope off,
   doze off, drabble, drag, draggle, drape, droop, drop asleep,
   drop off, drowse off, duck, embrace, encephalitis lethargica,
   endorse, endorsement, esteem, evocation, exchange colors, fail,
   fall, fall asleep, fall down before, favor, favorable vote, flag,
   flag down, flap, flare, flash, flop, flow, fog bell, fog signal,
   fog whistle, foghorn, gentle hint, genuflect, genuflection,
   gesture, give a signal, give consent, give the nod, glance,
   glimmer, glimmering, gloss over, go along with, go light,
   go to sleep, go-ahead, gong buoy, grant, green light, greet,
   greeting, hail, hail and speak, half-mast, hand-clasp, handshake,
   hang, hang down, have no objection, heliograph, hello, high,
   high sign, hint, hoist a banner, hold with, homage, how-do-you-do,
   hug, ignore, implication, imprimatur, in toto, inclination, indent,
   index, indication, inkling, innuendo, insinuation,
   international alphabet flag, international numeral pennant,
   intimation, invocation, kick, kiss, kiss hands, kneel, kneeling,
   kowtow, lapse, leer, let go, let ride, let slide, let slip,
   lethargy, lift the hat, look, lop, lose sight of, lose track of,
   make a leg, make a sign, make obeisance, making a leg,
   marker beacon, narcohypnosis, narcolepsy, narcoma, narcosis,
   narcotic stupor, narcotization, neglect, nod, nod assent,
   nod of assent, nod off, nod to, not care for, not get involved,
   not heed, not refuse, not think, notarization, nudge, obeisance,
   obsequiousness, okay, overlook, parachute flare, pass over, pend,
   permission, permit, pilot flag, poke, police whistle,
   preconization, presenting arms, prompt, prostration,
   pull the forelock, quarantine flag, radio beacon, raise a cry,
   ratification, ratify, receive, red flag, red light, requisition,
   respect, reverence, rocket, rubber stamp, sag, sailing aid, salaam,
   salutation, salute, sanction, say aye, say hello, say yes, scent,
   scrape, seal, seal of approval, sedation, semaphore,
   semaphore flag, semaphore telegraph, servility, settle to sleep,
   shake, shake hands, shock, sigil, sign, signal, signal beacon,
   signal bell, signal fire, signal flag, signal gong, signal gun,
   signal lamp, signal light, signal mast, signal post, signal rocket,
   signal shot, signal siren, signal tower, signalize, signature,
   signet, sleep, sleeping sickness, smile, smile of recognition,
   sopor, sound an alarm, sound the trumpet, spar buoy, speak, spoor,
   squat, stamp, stamp of approval, standing at attention, stoop,
   stop light, stupor, submission, submissiveness, subscribe to,
   subscription, suggestion, summons, supination, suspicion, swag,
   swing, swoon, symptom, take for granted, take kindly to, telltale,
   thanatosis, the nod, the wink, thumbs-up, touch, touch the hat,
   track, traffic light, traffic signal, trail, trance, uncover,
   unfurl a flag, validation, visa, vise, voice, vote,
   vote affirmatively, vote aye, vote for, warrant, watch fire, wave,
   wave a flag, wave the hand, weep, welcome, whisper, white flag,
   wigwag, wigwag flag, wink, wink at, yea, yea vote, yea-saying,
   yellow flag, yes, yield assent



Easton's 1897 Bible Dictionary:

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


Hitchcock's Bible Names Dictionary (late 1800's):

Nod, vagabond; fugitive