1 oftenthe radio [U] [sing] the activity of sending out programmes for people to listen to; the programmes that are sent out 无线电广播；电台节目: I always listen to the radio in the car. 我经常在车内收听无线电广播。I heard an interesting report on the radio this morning. 今早我从广播中收听到一则有趣的报道。a radio station/programme 电台；电台节目national/local radio 全国性╱地区性广播

2 [C] a piece of equipment that is used for receiving and/or sending radio messages or programmes (on a ship, plane, etc or in your house) 收音机；无线电设备 You may put, switch or turn a radio on or off. You may also turn it up or down to make it louder or quieter. 开收音机叫做put／switch／turn a radio on；关收音机叫做put／switch／turn a radio off。调高音量叫做turn it up；调低音量叫做turn it down。

3 [U] the sending or receiving of messages through the air by electrical signals 无线电传送: to keep in radio contact 以无线电保持联络radio signals/waves 无线电信号；无线电波 radio verb [I,T] (past tense past participle radioed)