sus·te·nance

[suhs-tuh-nuhns]
noun
1.
means of sustaining life; nourishment.
2.
means of livelihood.
3.
the process of sustaining.
4.
the state of being sustained.

Origin:
1250–1300; Middle English sustena(u)nce < Anglo-French; Old French sostenance. See sustain, -ance

sus·te·nance·less, adjective
non·sus·te·nance, noun
self-sus·te·nance, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To sustenance
00:10
Sustenance is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Collins
World English Dictionary
sustenance (ˈsʌstənəns) [Click for IPA pronunciation guide]
 
n
1.  means of sustaining health or life; nourishment
2.  means of maintenance; livelihood
3.  Also: sustention the act or process of sustaining or the quality of being sustained
 
[C13: from Old French sostenance, from sustenir to sustain]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

sustenance
c.1300, "means of living, subsistence, livelihood," from O.Fr. sustenance (Fr. soutenance), from L.L. sustinentia "endurance," from L. sustinens, prp. of sustinere (see sustain). Meaning "action of sustaining life by food" is from late 14c. Sense of "nourishment" is recorded from c.1489.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
After the first frost, they retreat to their underground burrows and snooze
  until spring, drawing their sustenance from body fat.
The search for food and water leads them to the best place to find sustenance
  and shelter.
But gutless, vote hungry politicians need sustenance.
The only pertinent question is what kind of culture fires our imagination and
  provides the sustenance of our daily lives.
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