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To plagiarize is to take someone else's words or ideas and put them in your own work as though you had thought of them yourself. The key is the missing credit, not the copying. Quoting a whole paragraph is fine if you say where it came from; using one clever idea without saying whose it was is plagiarism. It applies to essays, research papers, news articles, songs, code, designs — anywhere work is supposed to be yours. This is a serious accusation in English-speaking universities, much heavier than the tone students sometimes expect. A student who plagiarizes can fail the course or be expelled, and a journalist who plagiarizes usually loses their job. So use the word carefully: saying someone plagiarized is close to calling them dishonest, not merely lazy. The related noun is 'plagiarism' (the act) and the person is 'a plagiarist'. British writing usually spells the verb 'plagiarise', American 'plagiarize'; both are the same word and Taiwan's textbooks generally follow the American -ize. Note that it works both ways round: you plagiarize a person, and you also plagiarize the thing you took ('he plagiarized my essay').
抄襲、剽竊（把別人的文字或想法拿來當成自己的，沒有註明出處）
組成From Latin plagiarius, which meant a kidnapper — someone who steals another person's slave or child. A Roman poet used it as a joke for people who stole his verses, and the joke stuck; the modern word keeps that idea of stealing something living that belongs to someone else. The -ize ending simply makes it a verb, 'to act as a plagiary'.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，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。
plagiarizeverb/ˈpleɪd͡ʒəɹaɪz/
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To use, and pass off as one's own, someone else's writing, speech, ideas, or other intellectual or creative work, especially in an academic context; to commit plagiarism.
- She was caught trying to plagiarize an article for her thesis.
- It’s unethical to plagiarize someone else’s work for personal gain.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。