1912, in the meaning defined above
Why Is 'Celtic' Pronounced Two Ways?
\SELT\ has been heard for many centuries; \KELT\, just a few.
“Celticist.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Celticist. Accessed 2 Oct. 2023.
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