Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: plagiary 'plagiarism' (17-19 centuries), from Latin plagiarius 'thief', from plagium 'hunting net'

plagiarism

 noun
     
pla‧gia‧ris‧m
1 [uncountable] when someone uses another person's words, ideas, or work and pretends they are their own:
The journal accused the professor of plagiarism.
2 [countable] an idea, phrase, or story that has been copied from another person's work, without stating where it came from:
claims that there are plagiarisms in the new software
—plagiarist noun [countable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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