Fatemeh Azizmohammadi - Ph.D of English literature, Arak Azad University
Farnaz Shamaei - M.A of English Language Teaching, Arak Azad University
Mojtaba Maghsoudi - Ph.D of English Language Teaching, Farhangiyan University

Bilinguals and multilinguals are rarely equal in their ability of their two or more languages. Often one of the languages is dominant but it may be changed over time. Most bilinguals will use their twolanguages for different purposes. while a person being more proficient in one of the two languages (inmost cases native-like) is called dominant bilingual, Balanced bilinguals are bilinguals who have equal proficiency in their languages. In the present study the interaction between dominant and balancedbilingualism and general English proficiency test was investigated. To this aim, 134 Iranian female andmale high school students of Arak were invited. A general English proficiency test and a bilingual questionnaire were administered to both groups and the Mann-whitney test was used for the analysis of the data. The results indicated that there is no difference between dominant and balanced bilingual learners in English vocabulary retention.

Dominant Bilingualism, Balanced Bilingualism, Vocabulary Retention