Webster's English Dictionary

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nod

1. nod \'na:d\ vb or nod.ded;  or nod.ding [ME nodden; akin to OHG hnoto-n 
   to shake, L cinis ashes m more at INCINERATE 1: to make a quick downward 
   motion of the head whether as a sign of assent , salutation, or command or 
   involuntarily from drowsiness 2: to incline or sway from the vertical as 
   though ready to fall  3: to bend or sway the upper part gently downward or 
   forward  4: to make a slip or error in a moment of abstraction  1: to 
   incline (as the head) downward or forward  2: to bring, invite, or send by 
   a nod  3: a signify by a nod  - nod.der n
2. nod n : the act of one who nods