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I think the best definition is basically an episode of an anime that if a viewer were to miss, it would not affect their perception of the plotline, story, characters, overall etc. So obviously there will be differing opinions on what people consider "filler". But then again, in certain series there have been fillers which give made-up backstories to characters. I suppose in that case it has a more literal definition of continuing a story while waiting for manga to advance...
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