n. The distribution of multimedia files over the Internet for playback on a mobile device, often in MP3 format.
v. Present participle of podcast.
Word Usage
"The term podcasting is a combination of ÂiPodÂ' and ÂbroadcastÂ' and describes type of syndicated digital audio that results in automatically downloadable files which are playable in portable media devices, such as but not limited to the iPod."