[pod-kast, ‐kahst] Digital Technology.
a digital audio or video file or recording, usually part of a themed series, that can be downloaded from a website to a media player or computer: Download or subscribe to daily, one-hour podcasts of our radio show.
verb (used without object), verb (used with object)
to record and upload as a podcast: He podcasts once a week on various topics. She podcasts her lectures.

2000-05; (i)pod + (broad)cast

podcaster, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
podcast (ˈpɒdˌkɑːst)
1.  an audio file similar to a radio broadcast, which can be downloaded and listened to on a computer, mp3 player, mobile phone, etc
vb , -casts, -casting, -cast, -casted
2.  (intr) to create such files and make them available for downloading
3.  (tr) to make (music, interviews, etc) available using this format
[from i(Pod) + broad(cast)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Dictionary.com's 21st Century Lexicon
Main Entry:  podcasting
Part of Speech:  n
Definition:  the Web-based broadcast of music which works with software that automatically detects new files and is accessed by subscription
Etymology:  2004; iPod + broadcasting
Dictionary.com's 21st Century Lexicon
Copyright © 2003-2014 Dictionary.com, LLC
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Example sentences
Another new initiative is the first podcasting radio station, with content
  taken entirely from listeners' submissions.
Coming down the pike will be the end of podcasting, because a minority of deaf
  people can't hear them.
But now that we've got podcasting, people will put it on iPods or whatever.
Now at the close of the week, let me lure you into a different dimension of the
  media: podcasting.
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