second language learning has emphasized the significance of vocabulary acquisition. In particular, vocabulary has received increased attention as witnessed by the substantial amount of empirical research on vocabulary learning strategies in the 1990s (e.g., Haastrup, 1991; Mondria & Wit-de-Boer, 1991; Wang, Thomas, Inzana, & Primicerio, 1993). Vocabulary is the very foundation of language use, be it for a receptive or productive dimension. Nation (1990) defined receptive learning as being able to recognize a word and recall its meaning when it is encountered in reading or listening, whereas productive learning not only refers to recognition and recall but also includes the ability to use the word at the appropriate time through speaking or writing. He further indicated that most students’ difficulties in both receptive and productive language use result from their inadequate vocabulary. Hence, promoting students’ vocabulary knowledge has become an educational priority as it is inextricably associated with knowledge acquisition and, therefore, academic achievement.