Bicameral meaning : 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. Of, having or relating to two separate legislative chambers or houses. Of a script or typeface: having two cases, upper case and lower case. (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.