medium² n [C] 1plural media /-dɪə; -diə/ a way of communicating information or expressing ideas to people 传播信息[思想]的媒介: The Internet is a powerful advertising medium. 互联网是强有力的广告媒介。 2plural mediums someone who says they are able to speak to dead people and receive messages from them 灵媒; 巫师