ˈəlij, -lēj noun
( -s )
Etymology: Middle English ulage, oylage, from Middle French eullage, oillage act of filling a cask, filling to replace leakage, from eullier, ouiller to fill a cask (from Old French ouil eye, bunghole, from Latin oculus eye) + -age — more at eye
: the amount that a container (as a cask or tank) lacks of being full : outage