复勘 (fù kān) is a formal noun meaning 're-investigation' or 're-examination', typically used in legal, administrative, or technical contexts. The first character 复 (fù) means 'again' or 're-', indicating repetition, while 勘 (kān) means 'to survey', 'to inspect', or 'to investigate' — often with connotations of careful, professional scrutiny (e.g., land surveying, forensic examination, or medical assessment). Together, they denote a second, official review of evidence, findings, or conditions, usually initiated due to doubt about prior conclusions or new information.

This term appears most frequently in official documents, court proceedings, public health investigations, and engineering reports. It implies procedural rigor and institutional authority — not casual rechecking, but a structured, authorized follow-up. While related to words like 复查 (fù chá), 复勘 carries stronger connotations of field-based or expert-led verification, especially where physical inspection or technical expertise is required, such as revisiting a crime scene or re-evaluating environmental test results.