‘断定’ is a verb meaning ‘to conclude definitively’ or ‘to judge with certainty’. It combines two characters: 断 (duàn), which means ‘to cut off’ or ‘to decide decisively’, and 定 (dìng), meaning ‘to fix’, ‘to settle’, or ‘to determine’. Together, they convey the sense of cutting off doubt and settling on a firm judgment — implying confidence, finality, and lack of hesitation. The word suggests that the conclusion is based on evidence, reasoning, or strong intuition, not speculation.

This verb is commonly used in formal writing, academic contexts, news reports, and reasoned arguments — for example, when scientists interpret data, detectives assess clues, or commentators evaluate social trends. It often appears with subjects like ‘he’, ‘she’, ‘we’, ‘experts’, or ‘the report’, followed by a clause introduced by ‘是’, ‘为’, or a that-clause. While it carries authority, overusing ‘断定’ without sufficient grounds can sound dogmatic or arrogant in spoken Chinese.