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Wiktionary
webcast

n. A video and/or audio broadcast transmitted via the Internet vb. To make such a broadcast

Wikipedia
Webcast

A webcast is a media presentation distributed over the Internet using streaming media technology to distribute a single content source to many simultaneous listeners/viewers. A webcast may either be distributed live or on demand. Essentially, webcasting is “ broadcasting” over the Internet.

The largest "webcasters" include existing radio and TV stations, who " simulcast" their output through online TV or online radio streaming, as well as a multitude of Internet only "stations". The term webcasting usually refers to non-interactive linear streams or events. Rights and licensing bodies offer specific "webcasting licenses" to those wishing to carry out Internet broadcasting using copyrighted material.

Webcasting is also used extensively in the commercial sector for investor relations presentations (such as annual general meetings), in e-learning (to transmit seminars), and for related communications activities. However, webcasting does not bear much, if any, relationship to web conferencing, which is designed for many-to-many interaction.

The ability to webcast using cheap/accessible technology has allowed independent media to flourish. There are many notable independent shows that broadcast regularly online. Often produced by average citizens in their homes they cover many interests and topics. Webcasts relating to computers, technology, and news are particularly popular and many new shows are added regularly.

Webcasting differs from podcasting in that webcasting refers to live streaming while podcasting simply refers to media files placed on the Internet.

Usage examples of "webcast".

The news of my alleged accidental death on Kedge-Lockaby will be webcast within a few hours.

Fletch, in managerial mode, and SC, finally showing her pregnancy, arguing angles for the wedding webcast with her crew while trying to keep paparazzi Marty and Jake in their corner.

Plus, they all want high-speed connectivity in the store so they can webcast their poetry slams.

He also webcasts the call to prayer, but there are no other believers in trans-Jovian space to answer the summons.

There were plenty of calls for behavioral scientists to study ways in which the public response to the news could be somehow anticipated and controlled—for research into popular public images of ETs, discussion of analogies with the response to missions like Apollo to the Moon and Viking to Mars, and suggestions that SETI proponents should make use of media like webcasts, games, and music to present SETI and ET themes “responsibly.