bicameral

Etymology

From bi- + Latin camera (“chamber”) + -al.

adj

1. Being or having a system with two, often unequal, chambers or compartments; of, signifying, relating to, or being the product of such a two-chambered system.
   the bicameral anatomy of the brain
   By preventing legislative usurpation in the beginning, the bicameral legislature avoids executive usurpation in the end. 1891, John William Burgess, Political Science and Comparative Constitutional Law, volume 2, page 108
   The legislature (Standeversammlung) is bicameral — the constitution of the co-ordinate chambers being finally settled by a law of 1868 amending the enactment of 1831. 1911, “Saxony”, in Encyclopædia Britannica Eleventh Edition
2. (government) Of, having, or relating to two separate legislative chambers or houses.
   Once the Senate votes, aides said, the first order of business in the bicameral talks will be to set an overall dollar figure […]. February 9, 2009, Carl Hulse, “In Congress, Aides Start to Map Talks on Stimulus”, in New York Times
3. (typography) Of a script or typeface: having two cases, upper case and lower case.
   Aspect values on bicameral fonts are based on the size of the lowercase characters. 2001, Yves Savourel, XML Internationalization and Localization, page 80
   Bicameral (upper- and lowercase) unserifed roman fonts were apparently first cut in Leipzig in the 1820s. 2004, Robert Bringhurst, The Elements of Typographic Style, version 3.0, page 255
   2004, Parmenides, Peter Koch, et al., Carving the Elements: A Companion to the Fragments of Parmenides, page 91, For more than a thousand years, classical Greek has been habitually written in a bicameral, polytonic alphabet (one with caps and lower case and a set of diacritics marking tone and aspiration).
4. (mentality) Relating to the functions of the two cerebral hemispheres in the history of human beings ‘hearing’ the speech of gods or idols, according to Julian Jaynes's theory of the bicameral mind.
   [The Linear B Tablets] were written directly in what I am calling the bicameral period. p.80; …to have an idea of the nature and range of the bicameral voices heard in the early civilizations. p.88; …how could [the brain] have been organized so that a bicameral mentality was possible? p.101; Like the queen in a termite nest or a beehive, the idols of a bicameral world are the carefully tended centers of social control, with auditory hallucinations instead of pheromones. p.144; …wherever and whenever civilization first began…there was a succession of kingdoms all with similar characteristics that, somewhat prematurely, I shall call bicameral. p.149; Bicameral gods [of conquering civilizations] are jealous gods. p.156, footnote; …I suggest that given man, language, and cities organized on a bicameral basis, there are only certain fixed patterns into which history can fit. p.159. How can we know that…idols ‘spoke’ in the bicameral sense? p.174. 1976, 1990, Julian Jaynes, The Origin of Consciousness in the Breakdown of the Bicameral Mind, Houghton Mifflin Company, Boston