magnetic pole

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Either of the two ends of a magnet at which the field of the magnet is most intense. Each pole is designated by the approximate geographic direction in which it points, either north or south. Like magnetic poles repel; opposite magnetic poles attract.
• noun A geomagnetic pole.

from the GNU version of the Collaborative International Dictionary of English.

• noun Either of two points where the lines of force of the earth's magnetic field are vertical.
• noun One of the two ends of a magnet where the magnetic field is strongest.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Either of the two points, near the ends of a magnet, at which the magnetic lines of force converge.
• noun Either of the two locations on a planet's surface at which the planet's magnetic field lines are vertical.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun either of two points where the lines of force of the Earth's magnetic field are vertical
• noun one of the two ends of a magnet where the magnetism seems to be concentrated