Lebensraum is a German term meaning 'living space' or 'ROOM to live'. It was used by the Nazi party in the 1930s and 1940s to refer to the expansion of German territory and population into Eastern Europe. The term was used to justify the Nazi's aggressive foreign policy and their occupation of other countries. The crossword solution for Lebensraum is 'ROOM', which accurately reflects the literal meaning of the term.