noun
secondary document; secondary source
Technical term used in computing and information science for documents that analyze, summarize, or index primary sources.
このデータベースには二次文献が多数収録されている。
This database contains many secondary documents.
一次文献 refers to primary sources (original research, raw data), while 二次文献 refers to secondary sources that analyze or summarize primary ones.
Compound of 二次 (secondary) and 文献 (document, literature).