Definition
Having two alphabets or two cases joined in a single system. The Latin, Greek, and Cyrillic scripts are all bicameral. They combine upper case (majuscules) and lower case (minuscules). Most other scripts, including Arabic, Hebrew, Thai, and Tibetan, are unicameral.
Source
— Robert Bringhurst — p. 322:
Having two alphabets or two cases joined in a single system.
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