two parts; two copies
Used as a quantity expression: something is divided into two parts, or two copies of a document are needed. For copies, 部 functions like a counter.
Please print two copies of the materials.
part two; the second part
Refers to the second part of a work, program, or document. 第二部 or 第2部 is often clearer, but 二部 can appear in headings or short references.
The table of contents says, "Part Two: Practical Section."
I prepared two copies of the meeting materials.
この報告書は二部に分かれている。
This report is divided into two parts.
After the intermission, the second part of the concert began.
The program was broadcast divided into two parts.
第二部 spells out the ordinal meaning explicitly, while 二部 alone can be ambiguous between 'part two' and 'two copies'.
Standard kanji spelling; used both for quantity such as two copies and for a part or section.
Numeral spelling using ２; practical in counts, headings, forms, and business writing.
A Sino-Japanese compound of 二, 'two,' and 部, 'part, section, copy.' The spelling directly reflects the modern meanings.