1. A change or going from one place, condition, thing, topic, etc. to another one: Jesse made a significant transition from being a university student to being a successful specialist in technology in a very short time.
2. In music, a passing from one key to a different one: Gabriel had a talent of making beautiful piano transitions that were very entertaining for his audiences. © ALL rights are reserved.

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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. A transition of an atom or molecule from one energy state to another, in which electric quadrupole radiation is emitted or absorbed.
2. A process in which an atom produces or absorbs quadrupole radiation when it changes from one energy level to another.

The change of an electron from one situation to another one, accompanied by the emission or an absorption of electromagnetic radiation.

A layer in the mantle between 400 to 700 kilometers across in which there is an increase in seismic velocity because of the phase changes of the minerals present to more closely-packed, denser forms.