1. Any object or system that is oppositely charged at two points, or poles; such as, a magnet or a polar molecule. 2. Any object or system that has equal magnitudes but opposite signs or which is oppositely charged at two points, or poles.

This includes a magnet or a polar molecule; more precisely, it is the limit as either charge goes to infinity, the separation distance to zero, while the product remains constant.

1. A localized distribution of positive and negative electricity, without a net charge, whose mean positions of positive and negative charges do not coincide.
2. A pair of equal and opposite electric charges, the centers of which do not coincide.
3. Any object or system which is oppositely charged at two points, or poles; such as, a magnet or a polar molecule.
4. A pair of equal and opposite charges an infinitesimal distance apart from each other.

A quantity that is characteristic of a charge distribution, equal to the vector sum over the electric charges of the product of the charge and the position vector of the charge.

The primary process by which an atom produces or absorbs radiation when it changes from one energy level to another one: An electric dipole transition takes place when an oscillating electric field interacts with the electric dipole (a separation of positive and negative charges) movement of an electron inside an atom during which an electric radiation is discharged or absorbed.

1. The total amount of polarization (dipole moment) caused by the movement of electrons within an atom.
2. The magnetic dipole moment which an electron possesses by virtue of its spin.
3. The total magnetic dipole moment associated with the orbital motion of all the electrons of an atom and the electron spins.

This is opposed to a nuclear magnetic moment.

The dipole or a pair of equal and opposite electric charges or magnetic poles that are separated by a short distance: A geomagnetic dipole is created by the Earth's magnetic field.