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n. An explanation that excludes important information for the sake of brevity, or of making the explanation or presentation easy to understand.

n. The process of making such an explanation.

n. a simplification that goes too far (to the point of misrepresentation)

n. an act of excessive simplification; the act of making something seem simpler than it really is

"A gross oversimplification is to consider the Web as the train and the Internet the railway system."

simplification   

overextension    minigame    bqv    beachball    debaucher