bi-, bin-, bino-, bis-
(Latin: two, twice, double, twofold; a number; it normally functions as a prefix)
This bi- is used before s, c, or a vowel. Don't confuse this bi- with another one which means "life".
All words except biennial referring to periods of time and prefixed by bi- are potentially ambiguous. Since bi- can be taken to mean either "twice each" or "every two", a word like "biweekly" can be understood as "twice each week" or "every two weeks".
2. Designating or of a number system in which the base used is two, each number being expressed in powers of two by using only two digits; specifically, "0" and "1".
3. Designating or of a musical form consisting of two main sections.
4. In chemistry, composed of two elements or radicals, or of one element and one radical [binary compounds].
A binary system in general is any system that allows just two choices; such as, a switch in an electronic system or a simple true or false test.
2. Involving the use of both ears.
3. Designating sound reproduction or transmission in which at least two sources of sounds are used to give a stereophonic effect.
2. With two eyepieces, as in a binocular microscope.
3. Involving or using both eyes, or relating to vision using both eyes.
As stated above, binoculars are field glasses adapted to the use of both eyes, in contrast with the telescope, which is a monocular instrument.
2. Having two eyes arranged to produce stereoscopic vision.
An optical device, such as a pair of field glasses or opera glasses, designed for simultaneous use by both eyes and consisting of two small telescopes joined with a single focusing device.