14th century, in the meaning defined at sense 1
Latin, from Greek Lēthē, from lēthē forgetfulness; akin to Greek lanthanein to escape notice, lanthanesthai to forget — more at latent
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“Lethe.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lethe. Accessed 17 Aug. 2022.
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