名詞 assertion:

1. a declaration that is made emphatically (as if no supporting evidence were necessary)
   同義詞：averment, asseveration
2. the act of affirming or asserting or stating something
   同義詞：affirmation, statement

1. A formal assertion of validity.
   確定，鑒定對(duì)效力的正式斷言
2. Such a questionable assertion is sure to provoke criticism.
   這種有問題的主張肯定會(huì)招致非議。
3. I seriously question a number of your assertions.
   對(duì)你所堅(jiān)持的說法，有幾點(diǎn)我甚為懷疑。
4. He spoke with assertion.
   他堅(jiān)定地說。

as.ser.tion

n.（名詞）
The act of asserting.
武斷：武斷的行為
Something declared or stated positively, often with no support or attempt at proof.
斷言：肯定的宣稱或陳述，通常沒有證據(jù)或不試圖證實(shí)

【引伸】
asser.tional
adj.（形容詞）