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Proficiency in speaking or understanding two or more dialects.
1970s; earliest use found in Language. From multidialectal + -ism, after multilingualism, bidialectalism.
礼仪网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。