modulation

1. Modification or regulation of something to achieve an appropriate measure or proportion; (countable) an instance of this. (uncountable)
2. Variation (especially softening or toning down) of brightness, form, etc.; (countable) an instance of this. (uncountable)
3. Variation in the activity or form of a cell in response to changes in the environment; (countable) an instance of this. (uncountable)
4. Chiefly preceded by a descriptive word: modification of an electromagnetic wave or other oscillating carrier wave to apply a signal to it; (countable) an instance of this; also, the extent to which such a wave is modified; and the modified wave or signal. (uncountable)
5. Variation of the intensity, pitch, and tone of the sound of a musical instrument or voice; inflection; (countable) an instance of this. (uncountable)
6. Changing of the key in a piece of music; also, the effect achieved by this as an element of harmony; (countable) an instance of this. (uncountable)
7. The quality of a typeface of having contrasting, thick and thin parts of the strokes; stroke-width variation. (uncountable) · Garamond has much modulation, while Helvetica has very little.
8. Changing of a thing from one form to another; (countable) an instance of this. (uncountable)

Plural modulations