sesquilingual 1. The difference between being monolingual and bilingual. 2. A situation in which people know one language and part ('half'?) of another one. —Coined by William Sherk as seen in his 'Introduction' to 500 Years of New Words, Doubleday Canada Limited, Toronto, Canada; 1983.
Found on http://www.wordinfo.info/words/index/info/view_unit/2659/
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