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sustenance (n.)

c. 1300, "means of living, subsistence, livelihood," from Old French sostenance "support, aid" (Modern French soutenance), from Late Latin sustinentia "endurance," from present participle stem of Latin sustinere (see sustain). Meaning "action of sustaining life by food" is from late 14c. Sense of "nourishment" is recorded from late 15c. Related: Sustenant.

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Definitions of sustenance from WordNet

sustenance (n.)
a source of materials to nourish the body;
Synonyms: nutriment / nourishment / nutrition / aliment / alimentation / victuals
sustenance (n.)
the financial means whereby one lives;
Synonyms: support / keep / livelihood / living / bread and butter
sustenance (n.)
the act of sustaining life by food or providing a means of subsistence;
they were in want of sustenance
Synonyms: sustentation / sustainment / maintenance / upkeep
From wordnet.princeton.edu