From Middle English, a borrowing from Old French, from sustenir (14c) with the suffix -ance, from Vulgar Latin *sustenire, from Latin sustinere. Cf. also Late Latin sustinentia.
sustenance (countable and uncountable, plural sustenances)
- Something that provides support or nourishment.
2006, Edwin Black, chapter 2, in Internal Combustion:
- More than a mere source of Promethean sustenance to thwart the cold and cook one's meat, wood was quite simply mankind's first industrial and manufacturing fuel.
something that provides support or nourishment