n. The condition of being bilingual; the ability to speak two languages.
the GNU version of the Collaborative International Dictionary of English
n. Quality of being bilingual.
The Century Dictionary and Cyclopedia
n. The habitual colloquial use of two languages by the same person in different relations.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the ability to speak two languages colloquially
Word Usage
"Now, that kind of bilingualism is necessary, not primarily as an epistemic or even economic tool, but because you cannot understand and really own your language unless you have also another language."