Webcast
Definition 1 of 2

Formal usage
In formal contexts, use 'webcast' to discuss digital presentations.

The university will hold a formal webcast on their upcoming programs.
Technical accuracy
To discuss technical details, specify format and specifications.

The webcast will be available in HD quality.
Casual reference
In casual conversations, it's acceptable to refer to a webcast simply as a 'stream' or 'video'.

I watched a great stream on art yesterday.
Compare with
webinarpodcastlivestreambroadcast
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