1. a person or thing that cancels something
2. a device or mechanism used to cancel or eliminate something
Usage: technical

Examples

• The noise canceler in my headphones blocks out background sounds.
• She was known as a serial canceler who frequently backed out of plans.
• The echo canceler improved the quality of the phone call.
• The automatic canceler stopped the machine when it detected an error.
• He installed a feedback canceler in the sound system.
• The subscription canceler helped users easily end unwanted services.