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1646, in the meaning defined above
Late Latin accension-, accensio, from Latin accensus (past participle of accendere to set on fire, from ad- + -cendere, from candēre to glow) + -ion-, -io -ion
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“Accension.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/accension. Accessed 16 Aug. 2022.
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