1948, in the meaning defined above
Time Traveler for protolanguage
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Cite this Entry
“Protolanguage.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/protolanguage. Accessed 11 Aug. 2022.
More from Merriam-Webster on protolanguage
Britannica.com: Encyclopedia article about protolanguage
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