subsistence (n.) Look up subsistence at Dictionary.com
early 15c., "existence, independence," from Late Latin subsistentia "substance, reality," from Latin subsistens, present participle of subsistere "stand still or firm," from sub "under, up to" (see sub-) + sistere "to assume a standing position," from stare "to stand" (see assist). Properly a loan-translation of Greek hypostasis "subsistence," literally "anything placed under." Meaning "provision of support for animal life" is from 1640s.