Pronunciation: (lā'buns-roum", -bunz-), [key]
—n. (often l.c.)
1. additional territory considered by a nation, esp. Nazi Germany, to be necessary for national survival or for the expansion of trade.
2. any additional space needed in order to act, function, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.