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multiplet

[muhl-tuh-plet, -plit]
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noun Physics.
  1. a group of several related spectral lines, usually of nearly the same wavelengths.
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Origin of multiplet

First recorded in 1920–25; multi- + (tri)plet
Also called multiplet line.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for multiplet

multiplet

noun physics
  1. a set of closely spaced lines in a spectrum, resulting from small differences between the energy levels of atoms or molecules
  2. a group of related elementary particles that differ only in electric charge
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Word Origin

from multiple; on the model of doublet
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012