[bahy-nuh-ree, -ner-ee] 
adjective, noun, plural -ries.| 1. | consisting of, indicating, or involving two. |
| 2. | Mathematics.
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| 3. | Chemistry. noting a compound containing only two elements or groups, as sodium chloride, methyl bromide, or methyl hydroxide. |
| 4. | Metallurgy. (of an alloy) having two principal constituents. |
| 5. | a whole composed of two. |
| 6. | Astronomy. binary star. |
| 7. | Also called binary number. Mathematics. a number expressed in the binary system of notation. |
| a system of two stars that revolve about their common center of mass. |
| bi·na·ry (bī'nə-rē) adj.
Something that is binary, especially a binary star. [Middle English binarie, from Late Latin bīnārius, from Latin bīnī, two by two; see dwo- in Indo-European roots.] |
Anything composed of two parts. In modern computers, information is stored in banks of components that act like switches. Since switches can be either on or off, they have a binary character, and we say that the computer uses “binary arithmetic” to do its work.
binary bi·na·ry (bī'nə-rē)
adj.
Characterized by or consisting of two parts or components; twofold.
Consisting of or containing only molecules having two kinds of atoms.
binary (bī'nə-rē) Pronunciation Key
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| binary star
A system of two stars that orbit a common center of mass, appearing as a single star when visible to the unaided eye. The orbital periods of binary stars range from several hours to several centuries. By some estimates, at least half of the stars in the Milky Way galaxy are members of binary star systems. Also called double star. ◇ Binary stars are divided into four main classes based on how their dual nature is detected. A visual binary can be resolved telescopically into its two components. Only one star of an astrometric binary is visible, but the unseen component can be identified from its gravitational effect on the visible star, causing it to oscillate slightly, or wobble, against the background of more distant stars. The two components of a spectroscopic binary are identified based on their varying orbital velocities toward or away from Earth as revealed by periodic Doppler shifts in their spectral lines. In an eclipsing binary, the two components orbit each other in such a way that they periodically obscure or eclipse each other as viewed from Earth, causing changes in their observed brightness. Eclipsing binaries are also considered a kind of variable star. ◇ Two stars that lie very close to each other along an observer's line of sight but that are not associated with each other in a gravitational system are known as optical binaries. Although they appear close to each other in the sky, such stars are actually very distant from each other in space. See also multiple star, variable star. |
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(2005-02-21)
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