An Etymological Dictionary of Astronomy and Astrophysics
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A group of spectral lines arising from transitions having a common lower energy level.

From → multi- + -plet on the model of triplet.

Bastâyé, from bastâ-→ multi- + euphonic -yé, from -é nuance suffix.

A generalization of the concept of multiplet to the case when there are several quantum numbers that describe the quantum-mechanical states.

→ super-; multiplet.