“One part” in Japanese
Short answer
One part in Japanese is “一部” (ichibu). Full meaning: one part, one portion, one section; one copy (of a book), (one) complete set (of books).
Other ways to say “One part” in Japanese
１液
ichieki one-part, single-part, single-component
一部分
ichibubun one part, one portion, one section
一局部
ichikyokubu one part
いちぶ
ichibu one part, one portion, one section; one copy (of a book), (one) complete set (of books)
一箇所
ikkasho one place, (all in) the same place, one spot, one location, one part, one passage
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