modulation

(mŏjˌə-lāˈshən)

1. The act or process of modulating.
2. The state of being modulated.
3. Music
   a. A passing or transition from one key or tonality to another.
   b. The result of such a transition.
4. a. A change in stress, pitch, loudness, or tone of the voice; an inflection of the voice.
   b. An instance of such a change or an inflection.
5. The harmonious use of language, as in poetry or prose.
6. Electronics The variation of a property of an electromagnetic wave or signal, such as its amplitude, frequency, or phase.