ぶぶん
part, section
One section of a thing with a blade splitting it, so a part of a part. Not the whole essay: the paragraph somebody has underlined twice. A bun ぶ, and a bun ぶん of that: ぶぶん.
全部 ぜんぶ is all of it; 部分 is a portion of it.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.