You can picture two claims put side by side and refusing to fit: if this one is true, that one cannot be. Contradiction is the name for that clash — usually the clash itself, sometimes the act of pointing it out.
From the word’s history
The noun of contradict, from Latin contradicere 'to speak against': contra 'against' + dicere 'to say'. The picture inside it is still two voices talking against each other.
是 contradict 的名詞形，來自拉丁文 contradicere「對著說」：contra「相對」＋ dicere「說」。字裡藏的畫面一直沒變：兩個聲音互相頂著，只是這個名詞把那個狀態整包裝起來當成一件事來講。
Online Etymology Dictionary, entry 'contradict', https://www.etymonline.com/word/contradict
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原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
contradictionnoun/ˌkɒntɹəˈdɪkʃən/
- 1
The act of contradicting.
- His contradiction of the proposal was very interesting.
- 2
A statement that contradicts itself, i.e., a statement that claims that the same thing is true and that it is false at the same time and in the same senses of the terms.
- There is a contradiction in Clarence Page's statement that a woman should have the right to choose and decide for herself whether to have an abortion and at the same time she should not have that right.
- There is a contradiction in what you say: she can't be both married and single.
- 3
A logical inconsistency among two or more elements or propositions.
- Marx believed that the contradictions of capitalism would lead to socialism.
- 4
human-scienceslogicmathematicsA proposition that is false for all values of its propositional variables or Boolean atoms.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。