Definitions from Wiktionary (modulation)

▸ noun:  (uncountable) Modification or regulation of something to achieve an appropriate measure or proportion; (countable) an instance of this.
▸ noun:  (art, uncountable) Variation (especially softening or toning down) of brightness, form, etc.; (countable) an instance of this.
▸ noun:  (biology, uncountable) Variation in the activity or form of a cell in response to changes in the environment; (countable) an instance of this.
▸ noun:  (engineering, physics, uncountable) 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.
▸ noun:  (music)
▸ noun:  (uncountable) Variation of the intensity, pitch, and tone of the sound of a musical instrument or voice; inflection; (countable) an instance of this.
▸ noun:  (uncountable) 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.
▸ noun:  (typography, countable) The contrast between the thick and thin parts of the strokes of a typeface.
▸ noun:  (uncountable) Changing of a thing from one form to another; (countable) an instance of this.
▸ noun:  (obsolete)
▸ noun:  (uncountable) Harmonious use of language in poetry or prose.
▸ noun:  (architecture, uncountable, rare) Modification of the parts of a classical Greek or Roman building to achieve appropriate proportions by measuring in modules (“standard units of measure, usually the diameter or radius of a column at the base of a shaft”).
▸ noun:  (countable, Christianity) Any of the musical notes in ecclesiastical modes of music on which a melodic phrase had to begin and end.
▸ noun:  (uncountable) Arrangement or composition, or performance, of music in a certain key or mode; also (countable) a series of musical notes, chord, or tune analyzed according to a key or mode.
▸ noun:  (uncountable) Making music or singing; (countable) a melody, a tune; also (chiefly in the plural), a musical note.

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