/ˈeətaɪm ||; ˈɛrˌtaɪm/noun [U]:
1 the amount of time that is given to a subject on radio or television （电台或电视节目就某主题的）广播时间
2 the amount of time that is paid for when you use aMOBILE PHONE(= a telephone that you can carry around with you) （使用移动电话要付费的）通话时间: This deal gives you 90 minutes free airtime a week. 这交易每星期给你90分钟免费通话时间。