Plagiarism is defined in ICMJE guidelines under "Scientific Misconduct, Expressions of Concern, and Retraction" (http://www.icmje.org/recommendations/browse/publishing-and-editorial-iss...).
It is considered as an unethical practice and consists of reproducing someone else's ideas, study, methods, results including data/figures/tables, copy pasting sentences directly etc.
It is better to write to the journal and ask for more information/details regarding this matter so that you get a clarity on what portion of your article is plagiarized.
You should send an apology letter to the journal editor and offer an explanation. Journals generally ask the authors to retract the article.
Suggested reading: https://www.hps.cam.ac.uk/students/plagiarism
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