1. calls off or stops something that was planned
Usage: third person singular present tense of ‘cancel’
2. marks or stamps something to show it cannot be used again
Usage: third person singular present tense of ‘cancel’
3. eliminates the effect of something by balancing it out
Usage: third person singular present tense of ‘cancel’; often used with ‘out’

Examples

• She cancels her appointment when she feels sick.
• The post office cancels stamps to prevent reuse.
• The airline cancels flights during severe weather.
• He cancels his subscription to the magazine.
• The noise from the fan cancels out the street sounds.
• The teacher cancels class due to the snow day.