断定(だんてい)

断定(だんてい) means making a firm, conclusive judgment about something with certainty. Functions as both a noun and a suru verb.

COMMON EXPRESSIONS:

• 断定(だんてい)する: to conclude definitively
• 断定(だんてい)できない: cannot make a definitive conclusion
• 断定(だんてい)的(てき)な: conclusive, definitive (na-adjective)
• 断定(だんてい)を避(さ)ける: to avoid making definitive statements

SIMILAR WORDS:

• 判断(はんだん): judgment (broader, can be tentative)
• 結論(けつろん): conclusion (the end result of reasoning)
• 決(き)めつける: to decide/assume (often prematurely, negative nuance)
• 断言(だんげん): to assert firmly (emphasizes the verbal declaration)

REGISTER:
Formal. Common in legal, academic, and journalistic contexts. In everyday speech, 決(き)める or 判断(はんだん)する is more natural.