‘校勘’ (jiào kān) is a formal noun referring to the meticulous scholarly process of comparing different versions of a classical or historical Chinese text to identify and correct errors—such as transcription mistakes, omissions, or interpolations—by cross-referencing authoritative editions, manuscripts, or commentaries. The character 校 (jiào) means ‘to compare, verify, or collate’, while 勘 (kān) means ‘to investigate, examine, or inspect thoroughly’. Together, they convey rigorous textual verification, especially in fields like philology, history, and traditional literature.

This term is used almost exclusively in academic, editorial, or publishing contexts—never in casual speech. It’s central to preparing critical editions of ancient texts (e.g., Confucian classics or Tang poetry collections), where accuracy depends on reconciling variant readings across centuries of transmission. While modern editors may perform ‘proofreading’ (校对, jiào duì), 校勘 implies deeper historical and philological analysis, often involving paleography, manuscript study, and citation of source evidence.