Definition of noding:
(v) :
(ambitransitive) To incline the head up and down, as to indicate agreement.
(v) :
(ambitransitive) To briefly incline the head downwards as a cursory greeting.
(v) :
(transitive) To signify by a nod.
(n) :
An instance of inclining the head up and down, as to indicate agreement, or as a cursory greeting.
(v) :
(ambitransitive) To sway, move up and down.
(v) :
(intransitive) To gradually fall asleep.