noun
three parts; three copies
Used for dividing something into three sections, or for three copies of a document or publication. Common in contexts like 三部作 (trilogy) or 三部構成 (three-part structure).
この映画は三部作の最終章です。
This movie is the final chapter of a trilogy.
契約書を三部作成してください。
Please prepare three copies of the contract.
三部作 means 'trilogy', a work in three parts, while 三部 alone refers to the three parts or copies themselves.
Compound of 三 (three) and 部 (part, copy). The reading さんぶ is a standard on'yomi combination.