WordNet (r) 3.0 (2006):

podcast
    v 1: distribute (multimedia files) over the internet for
         playback on a mobile device or a personal computer

The Free On-line Dictionary of Computing (30 December 2018):

podcast

    Any series of audio files that can be
   downloaded from the Internet, often released on some regular
   schedule, e.g. daily or weekly.

   Podcasts are named after Apple Computer, Inc.'s iPod
   portable audio players, though most podcasts are in MP3
   format and so can be played on virtually any modern audio
   player.

   (2009-12-16)