Dictionary.net

The distribution of a deceased person's property by any means other than probate. Many types of property pass free of probate, including property left to a surviving spouse and property left outside of a will through probate-avoidance methods such as pay-on-death designations, joint tenancy ownership, living trusts and life insurance. Property that avoids probate is sometimes described as the “nonprobate estate.” Nonprobate distribution may also occur if the deceased person leaves an invalid will. In that case, property will pass according to the particular state's laws of intestate succession.