<p><strong>Verb</strong></p><ul><li>(used without object): to make a slight, quick downward bending forward of the head, as in assent, greeting, or command.</li><li>to let the head fall slightly forward with a sudden, involuntary movement when sleepy.</li><li>to doze, especially in a sitting position: The speaker was so boring that half the audience was nodding.</li><li>(of trees, flowers, plumes, etc.) to droop, bend, or incline with a swaying motion.</li></ul><p><strong>Noun</strong></p><ul><li>a short, quick downward bending forward of the head, as in assent, greeting, or command, or because of drowsiness.</li><li>a brief period of sleep; nap.</li><li>a bending or swaying movement.</li><li>a gesture or action indicating that someone or something has been approved, selected, recognized, etc.</li><li>a nomination, as for an office or award.</li></ul>