octant

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noun oc·tant \ˈäk-tənt\

Definition of octant

  1. 1 :  an instrument for observing altitudes of a celestial body from a moving ship or aircraft

  2. 2 :  any of the eight parts into which a space is divided by three coordinate planes

Origin and Etymology of octant

Latin octant-, octans eighth of a circle, from octo


First Known Use: 1672


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