# octant

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## oc·tant

(ŏk′tənt)*n.*

**1.**One eighth of a circle.

**2.**

**a.**A 45° arc.

**b.**The area enclosed by two radii at a 45° angle and the intersected arc.

**3.**An instrument based on the principle of the sextant but employing only a 45° angle, used as an aid in navigation.

**4.**

*Astronomy*The position of a celestial body when it is separated from another by a 45° angle.

**5.**One of eight parts into which three-dimensional space is divided by three usually perpendicular coordinate planes.

**oc·tan′tal**(ŏk-tăn′təl)

*adj.*

## octant

(ˈɒktənt)*n*

**1.**(Mathematics)

*maths*

**a.**any of the eight parts into which the three planes containing the Cartesian coordinate axes divide space

**b.**an eighth part of a circle

**2.**(Astronomy)

*astronomy*the position of a celestial body when it is at an angular distance of 45° from another body

**3.**(Navigation) an instrument used for measuring angles, similar to a sextant but having a graduated arc of 45°

[C17: from Latin

*octans*half quadrant, from*octo*eight]## oc•tant

(ˈɒk tənt)*n.*

**1.**the eighth part of a circle.

**2.**any of the eight parts into which three mutually perpendicular planes divide space.

**3.**an instrument having an arc of 24°, used by navigators for measuring angles up to 90°.

**4.**the position of one heavenly body when 45° distant from another.

**oc•tan′tal**(-ˈtæn tl)

*adj.*

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Noun | 1. | octant - a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibrationlimb - the graduated arc that is attached to an instrument for measuring angles; "the limb of the sextant" measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something |

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