The meaning and definition of bilingualism varies tremendously from one situation to the other. The Webster Dictionary (1961) defines bilingualism as having or using two languages especially as spoken with the frequency characteristics of a native speaker; a person using two languages especially habitually and with control like that of a native speaker.
"The Origin, Notions, Extent And Outcome Of Bilingualism: Implication For Effective Teaching And Learning Of English Language In Nigerian Junior Secondary Schools,"
Academic Leadership Journal: Vol. 8
, Article 71.
Available at: http://scholars.fhsu.edu/alj/vol8/iss4/71