Definition of "modulator" [mod•u•la•tor]

• A device used to modulate an electromagnetic wave. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The modulator is a very fast shutter that is opened and closed by the stream of data from the processors."
• "The modulator is a low-power FM transmitter that broadcasts on an unused frequency."
• "What does it mean to say that what comes out of the modulator is a vector?"