1 n-count If you are a fan of someone or something, especially a famous person or a sport, you like them very much and are very interested in them. usu n N, N of n As a boy he was a Manchester United fan..., I am a great fan of rave music. 2 n-count A fan is a flat object that you hold in your hand and wave in order to move the air and make yourself feel cooler. 3 verb If you fan yourself or your