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Electric Dipole Moment:
The electric dipole moment of an electric dipole is defined as the product of the magnitude of either of the charges and the vector distance separating them.

Mathematically,
$\vec{p} = q \cdot 2\vec{a}$
where $q$ is the magnitude of one of the charges and $2\vec{a}$ is the displacement vector directed from the negative charge ($-q$) to the positive charge ($+q$).

It is a vector quantity, and its SI unit is Coulomb-meter ($\text{C}\cdot\text{m}$).