Definition of modulation noun from the Oxford Advanced Learner's Dictionary

     

    modulation

     noun
    noun
    BrE BrE//ˌmɒdjuˈleɪʃn//
     
    ; NAmE NAmE//ˌmɑːdʒəˈleɪʃn//
     
    [countable, uncountable]
     
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  1. 1the act of changing the quality of your voice in order to create a particular effect by making it louder, softer, lower, etc. Her vocal modulation was most impressive.
  2. 2(music) a change from one musical key (5) (= set of notes) to another the harmony and modulations of JS Bach
  3. 3(specialist) the act of changing the rate at which a sound wave or radio signal vibrates (= the frequency (3)) so that it is clearer Radio transmission employs deliberate modulation of a complex audio signal.
  4. 4(specialist) the act of influencing something by changing or controlling it This effect indicates long-lasting modulation of neural activity.

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