GNU Collaborative International Dictionary of English

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Found 2 definitions

1.       
   Binary , a. [L. binarius, fr. bini two by two, two at a time, fr. root of bis twice; akin to E. two: cf. F. binaire.] Compounded or consisting of two things or parts; characterized by two (things).
   1913 Webster
   Binary arithmetic, that in which numbers are expressed according to the binary scale, or in which two figures only,  0 and 1, are used, in lieu of ten; the cipher multiplying everything by two, as in common arithmetic by ten. Thus, 1 is one; 10 is two; 11 is three; 100 is four, etc. Davies & Peck. -- Binary compound (Chem.), a compound of two elements, or of an element and a compound performing the function of an element, or of two compounds performing the function of elements. -- Binary logarithms, a system of logarithms devised by Euler for facilitating musical calculations, in which 1 is the logarithm of 2, instead of 10, as in the common logarithms, and the modulus 1.442695 instead of .43429448. -- Binary measure (Mus.), measure divisible by two or four; common time. -- Binary nomenclature (Nat. Hist.), nomenclature in which the names designate both genus and species. -- Binary scale (Arith.), a uniform scale of notation whose ratio is two. -- Binary star (Astron.), a double star whose members have a revolution round their common center of gravity. -- Binary theory (Chem.), the theory that all chemical compounds consist of two constituents of opposite and unlike qualities.
   1913 Webster
   
         
       

2.       
   Binary, n. That which is constituted of two figures, things, or parts; two; duality.
   Fotherby.
   
   1913 Webster