“…The concept of glossing has not been largely studied by researchers until late in the 20 th century though it is certainly not a new phenomenon (Poole, 2012) and can be traced to the Middle Ages (Hong, 2010). Traditionally, a gloss is referred to as a comment, note, translation, definition, annotation, synonym or brief explanation provided either in L1 or L2 in the margins, footnote, or near the unknown words in order to make technical, difficult, unknown or unusual words in a written text comprehensible (Chen, 2016;Choi, 2016;Ertürk, 2016;Khezrlou, Ellis, & Sadeghi, 2017;Nation, 2013;O'Donnell, 2012;Schmitt, 2010;Taj et al, 2017;Türk & Erçetin, 2012;Yousefi & Biria, 2015;Xiaohui, 2010). The main reason for using glosses is to help learners to comprehend the text and acquire new words (Melhi, 2014;Vela, 2015).…”