Middle English, from Greek, of Semitic origin; akin to Hebrew lāmedh lamed
15th century, in the meaning defined at sense 1
Going Greek: 7 Words from the Greek...
When English borrows from another alphabet
“Lambda.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lambda. Accessed 2 Oct. 2023.
Britannica.com: Encyclopedia article about lambda
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