Legal Definition of Remainder: (a) The rest; the portion remaining after a part has been taken away; the residue. (b) The portion of an estate or property which is to be distributed after other portions have been disposed of. (c) An estate to take effect and be enjoyed after another estate has been determined | Learn about the legal definition and importance of remainder in estate planning and property distribution. Discover how this concept ensures assets are distributed according to wishes and how it helps protect assets for future generations or charitable causes