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14th century, in the meaning defined at sense 1
Middle English, from Anglo-French, from Latin sustentation-, sustentatio act of holding up, from sustentare to hold up, frequentative of sustinēre to sustain
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“Sustentation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sustentation. Accessed 18 Apr. 2021.
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