1297, "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 c.1386. Sense of "nourishment" is recorded from c.1489.