9 Grammatical Pitfalls
a Web-based audio broadcast via an RSS feed, accessed by subscription over the Internet
There is a podcast directory of offerings.
to deliver a Web-based audio broadcast via an RSS feed over the Internet to subscribers
They podcast a weekly political commentary.
2004; iPod + broadcast
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.