Etymology
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sustentation (n.)

late 14c., from Anglo-French, Old French sustentacion, sostentacion "sustaining of life," from Latin sustentationem (nominative sustentatio) "maintenance," noun of action from past participle stem of sustentare "hold upright, hold up; feed, nourish, support; hold out, endure, suffer," frequentative of sustinere (see sustain).

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Definitions of sustentation

sustentation (n.)
the act of sustaining life by food or providing a means of subsistence;
Synonyms: sustenance / sustainment / maintenance / upkeep
From wordnet.princeton.edu