[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:  podcast
Part of Speech:  n
Definition:  a Web-based audio broadcast via an RSS feed, accessed by subscription over the Internet
Example:  There is a podcast directory of offerings.
Etymology:  2004; iPod + broadcast
Usage:  computing
Main Entry:  podcast
Part of Speech:  v
Definition:  to deliver a Web-based audio broadcast via an RSS feed over the Internet to subscribers
Example:  They podcast a weekly political commentary.
Etymology:  2004; iPod + broadcast
Usage:  computing
Dictionary.com's 21st Century Lexicon
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Computing Dictionary

podcast definition

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.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Another month, another study that seems to pour cold water on the still-fiery podcast phenomenon.
Previous comment commendably ignoring the content of the podcast.
Our technology podcast is getting a new co-host and a new format.
Watch a video podcast describing the science behind the zodiacal light.
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