1. noun
a) A hand-held device consisting of concertinaed material, or slats of material, gathered together at one end, that may be opened out into the shape of a sector of a circle and waved back and forth in order to move air towards oneself and cool oneself.
I am a big fan of libraries.
b) An electrical device for moving air, used for cooling people, machinery, etc.
2. verb
We enjoyed standing at the edge of the cliff, being fanned by the wind..
Alice took up the fan and gloves, and, as the hall was very hot, she kept fanning herself all the time she went on talking.
Wikipedia foundation.