1. to make, construct, or form again: the cost of rebuilding the house. 2. (tr) to restore (a system or situation) to a previous condition: his struggle to rebuild his life. Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014.