Another word for "modulation" could be "adjustment," "regulation," or "variation," depending on the context in which it's used. For instance:
- In electronics or signal processing, "modulation" might be synonymous with "regulation" or "adjustment" when referring to altering signals.
- In music, "modulation" could be referred to as "key change" or "variation" when talking about changing the key or tone.
- In general contexts, "modulation" could be replaced with "variation" or "adjustment" to describe changes or modifications in a system or process.
If you have a specific context in mind, I can help narrow down the most suitable synonym!