Binary \Bi"na*ry\, 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]
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