1533, in the meaning defined at sense 1
Late Latin illation-, illatio, from Latin, action of bringing in, from inferre (past participle illatus) to bring in, from in- + ferre to carry — more at tolerate, bear
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“Illation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/illation. Accessed 3 Mar. 2021.
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