It has been observed that plagiarism is a problem across specialities and professions, and it is probably becoming more rampant than ever in this electronic age. Based on a body of literature primarily in applied linguistics, this review focuses on textual plagiarism and antiplagiarism in second language academic writing. Following a conceptualization of plagiarism and an examination of some terminology employed in the literature to address the complexity of the issue, a number of perspectives taken upon plagiarism in the literature are examined. These include a cultural interpretation, a developmental perspective, a disciplinary perspective, student beliefs and practices, faculty perceptions, and a focus upon antiplagiarism pedagogy. The challenge and opportunity involved in dealing with plagiarism is then highlighted by reviewing work that has analyzed the problem in connection with the Internet, by exemplifying some antiplagiarism detection devices, and by relating these to John Sinclair's "idiom principle" of linguistic structure. The article ends by suggesting a few lines of future research on plagiarism. Voices are being raised across the disciplines concerning the increasing prevalence of plagiarism and how to deal with it. Apart from the numerous books, articles, reports, and institutional handbooks concerned with plagiarism, an extremely large number of Web sites, often hosted by institutions of higher learning, provide guidance about plagiarism and how to avoid it. Plagiarism functions at different levels. On one level there are the so-called paper mills, online services that provide academic term papers for a fee. On another level there is what this article is more concerned with, namely, textual plagiarism, or the copying of sections of one text in the composition of another. To combat these practices, at both levels, an increasing number of plagiarism detection software applications are being developed and put into use. Ironically, however, in some cases, the same companies are both operating paper mills and offering antiplagiarism services. Together with the antiplagiarism movement there has developed what might be called a widespread antiplagiarism discourse. At the same time, alternative voices are also to be heard, especially among applied linguistics and language teachers, arguing for a more sympathetic approach to the issue.