14th century, in the meaning defined above
Middle English, from Late Latin indeclinabilis, from Latin in- + Late Latin declinabilis capable of being inflected, from Latin declinare to inflect — more at decline entry 1
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Cite this Entry
“Indeclinable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/indeclinable. Accessed 20 Oct. 2020.
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