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lambda

noun

lamb·​da ˈlam-də How to pronounce lambda (audio)
1
: the 11th letter of the Greek alphabet see Alphabet Table
2
: an uncharged unstable elementary particle that has a mass 2183 times that of an electron and that decays typically into a nucleon and a pion

Word History

Etymology

Middle English, from Greek, of Semitic origin; akin to Hebrew lāmedh lamed

First Known Use

15th century, in the meaning defined at sense 1

Time Traveler
The first known use of lambda was in the 15th century

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