noun pod·cast \ˈpäd-ˌkast\

Definition of podcast

Popularity: Bottom 40% of words
  1. :  a program (as of music or talk) made available in digital format for automatic download over the Internet

podcast verb
pod·cast·er noun

Origin of podcast

iPod, trademark for a portable media player + broadcast
First Known Use: 2004

Via Merriam-Webster Dictionary 

noun: podcast; plural noun: podcasts
  1. 1.
    a digital audio file made available on the Internet for downloading to a computer or portable media player, typically available as a series, new instalments of which can be received by subscribers automatically.
verb: podcast; 3rd person present: podcasts; gerund or present participle: podcasting; past tense: podcast; past participle: podcast
  1. 1.
    make (a digital audio file) available as a podcast.
early 21st century: from iPod + broadcast.

Wikipedia on the other side has a more inclusive definition, which, in my opinion, takes away from the general understanding of the word “podcast” :
“A podcast is a form of digital media that consists of an episodic series of audio, video, digital radio, PDF, or ePub files subscribed to anddownloaded through web syndication or streamed online to a computer or mobile device. The word is a portmanteau of “(i)Pod” and “broadcast.””
More from Wikipedia here.

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