Answer:
The answer is explained below.
Step-by-step explanation:
According to Plagiarism.org, the term plagiarism means an act of fraud because it involves stealing someone's work and lying about it. Merriam-Webster Dictionary points out that it means to use another's production without crediting the source. So, if the excerpt belongs to a Wikipediea article, it is necessary to cite it, otherwise it would be considered as plagiarism.