Meaning of OCTANT in English

OCTANT

ˈäktənt noun

( -s )

Etymology: Latin octant-, octans half quadrant, from octo eight

1.

a. : the position or aspect of a celestial body (as the moon or a planet) when halfway between conjunction or opposition and quadrature

b. : an instrument used for observing altitudes of a celestial body from a moving ship or aircraft and having a maximum angle of 45 degrees between its reflecting mirrors — compare sextant

2.

a. : one of the eight regions into which three usually orthogonal planes meeting in a point divide all three-dimensioned space around it

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

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.