Of such notice that researchers documented in their compendium about the spawn of Arabs and their language dwindled in mono-cultural boundary for many memorable years. It is of the fact that the relevance of Arabic language is not only restricted to the people spoken it as their mother language. Thus, It is globally applauded due to its effective recognitions and relevancies in to other cultures and all human strata. History shows that the place of Arabic language in multicultural society are very applausive, especially after the emergence of Islam, when Islam spread beyond its domain to other continents like Asia, Europe, Africa, America and etc. Eagering to learn Arabic by people become noticeable for many reasonable factors: religion, trade, diplomacy and etc. Historically, the position of Arabic language in multicultural societies especially Nigeria,(a largest African population), that has a predominant ethnic groups, cultures and more than 400 ethnic dialects, with over 185,0000000 population is given a warmly recognization and applausive. The reason is that, its entry into the country dated back to the seventh century of the Hijrah era and tenth century of Christian era. Centuries before the advent of Europeans in Nigeria, Arabic had been used for religious, social and cultural purposes. Therefore, this paper is aiming to give an expository analysis of the relevance of Arabic language in Multicultural societies taken Nigeria as a case study. Research shows that Arabic language has been having a positive impact on Nigeria's heritage, which by virtue of Islam, had established itself in Nigeria as the language of administration, literacy, education, history, legislation and etc before the arrival of colonial masters, to Nigerian development.