he believed that it bilingualism is the complete master of two different languages without interference between two linguistic processes
Oestreicher 1974
bilingualism as the natively control of two languages according to him
bloomfield 1933
bilingualism is the ability to produce complete meaningful utterances in the other language
haugen 1953
passive knowledge the ability to use this in the environment of the native language according to
Diebold 1961
according to him a bilingual are those people who need and use two or more languages in their everyday lives
grossjean 2010
according to them a bilingual is an individual who possesses more than one language competence
Valdes and Figueroa 1994
for him a bilingual is someone who practices the alternate use of two or more languages
Mackey 1970
he believed that a bilingual is capable of speaking a second language while following the concepts and structures of that language rather than paraphrasing his or her mother tongue
Titone 1972
they define multilingualism as the organized and unorganized practices of using three or more languages and the handling of more than two languages
bianco and aronin 2020
he defined multilingualism as should not be seen as a collection of languages but rather as a complex of specific semiotics resources