1. the amount of time that a radio or television program is broadcast
2. the amount of time available for making phone calls on a mobile device
3. the time during which something is in the air or airborne

Examples

• The commercial bought thirty seconds of airtime during the Super Bowl.
• The radio station donated free airtime to promote the charity event.
• I need to buy more airtime for my prepaid phone.
• The basketball player got impressive airtime on that dunk.
• The show’s airtime was moved to a later slot.
• Her phone ran out of airtime in the middle of the call.
• The skateboarder achieved maximum airtime off the ramp.