1. Pertaining to something that is not balanced or regularly arranged on opposite sides of a line or around a central point.
2. A reference to something that is lacking equality, balance, or harmony and so not having the same shape and size on both sides.
3. In chemistry, a reference to a carbon atom which has four different atoms or structural groups attached to it, resulting in an unbalanced spatial arrangement of atoms in a molecule, so that the molecule cannot be superimposed on its mirror image.
4. In electrical engineering, relating to varying conductivity or a description of a substance or a device that exhibits varying or different conductivities for electric currents flowing through it in different directions.
5. Referring to an aircraft which is unbalanced because of an unequal thrust from two or more sources; such as, when one engine of a pair is not functioning properly.