octant meaning in English

n.
1.八分圆；八分区；卦限；八分仪；【植物；植物学】八分体。
2.【天文学】相对两天体成四十五度的位置。

Early introduction and studies on the western double reflecting octant in china
中国早期对西方双反射八分仪的介绍和研究
In each iteration , no trigonometric function is used and only two multiplications are required . by taking the advantage of symmetry , only the points in one octant are need to be generated
该算法避免三角函数的运算，每步仅需两次乘法，并且充分利用对称性只计算一个八分象限的点。
The three axes determine three planes , the - , - and - plane . which divide space into eight octants . to each pointin space corresponds an ordered triple of numbers . its cartesian coordinates , which measure its directed distances from the three planes
三个坐标决定三个坐标面,面,面,面,这些坐标面将空间分成八个卦限,空间中点每个点都对应一个有序三元组和分别表示点到三个坐标面的有向距离