From Middle English casten, from Old Norse kasta ("to throw, cast, overturn"), from Proto-Germanic *kastōną ("to throw, cast"), of unknown origin. Cognate with Scots cast ("to cast, throw"), Danish kaste ("to throw"), Swedish kasta ("to throw, cast, fling, toss, discard"), Icelandic kasta ("to pitch, toss"). In the sense of "flinging", displaced native warp.
The senses relating to broadcasting are based on that same term; compare -cast.
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