Webster's English Dictionary

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binary

1. bi.na.ry \'bi--n*-re-\ aj [LL binarius, fr. L bini] 1: compounded or 
   consisting of or marked by two things or parts  2: composed of two chemical 
   elements, an element and a radical that acts a s an element, or two such 
   radicals 3: relating to, being, or belonging to a system of numbers having 
   two as i ts base {~ digit} 4: relating two logical elements  5a: having two 
   musical subjects or two complementary sections  5b: DUPLE - used of measure 
   or rhythm 
2. binary n : something constituted of two things or parts