名詞 negation:

1. a negative statement; a statement that is a refusal or denial of some other statement
2. the speech act of negating
3. (logic) a proposition that is true if and only if another proposition is false

1. The author boxed the compass of negation in his article.
   該作者在文章中依次探討了各種反面的意見(jiàn)。
2. Shaking the head is a sign of negation.
   搖頭表示否認(rèn)。
3. This theory is a negation of all traditional beliefs.
   這理論否定了一切傳統(tǒng)信念。

ne.ga.tion

n.（名詞）
The act or process of negating.
否定：否認(rèn)的行為或程序
A denial, contradiction, or negative statement.
否定，反對(duì)或否定的原則
The opposite or absence of something regarded as actual, positive, or affirmative.
不存在：被認(rèn)作為事實(shí)的，積極的或肯定的事物的反義詞或缺乏

【引伸】
nega.tional
adj.（形容詞）