From HomoExcelsior

1. Either extremity of an axis through a sphere.
2. Either of the regions contiguous to the extremities of the earth's rotational axis, the North Pole or the South Pole.
3. A magnetic pole.
4. Either of two oppositely charged terminals, as in an electric cell or battery.
5. A celestial pole.
6. Either extremity of the main axis of a nucleus, a cell, or an organism.
7. Either end of the spindle formed in a cell during mitosis.
8. The point on a nerve cell where a process originates.
9. A fixed point of reference.
10. The origin in a polar coordinate system; the vertex of a polar angle.

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