illegitimate child born to a woman who is not married to the father. immigrant person moving into a country from another country. immigration immigration is when an individual goes into a new country to live. imp. (abbreviation) imported. indentured servant person who is bound into the service of another person for a specified period, usually seven years in the 18th and 19th centuries to pay for passage to another country. index in genealogical terms, an index is an alphabetical list of names that were taken from a particular set of records. For example, a census record index lists the names of individuals that are found in a particular set of census records. Indexes mostly come in book form, but you can also find them on CD-ROM, microfilm, and microfiche. inf. infantry. infant person under legal age. inhab (abbreviation) inhabitant; inhabited. instant of this month. International Genealogical Index (IGI) the International Genealogical Index (IGI) is one of the resources of the Family History Library of the Church of Jesus Christ of Latter-day Saints. Containing approximately 250 million names, it is an index of people's names that were either submitted to the church, or were extracted from records that the church has microfilmed over the years. You can use the IGI to locate information about your ancestors. intestate used to denote a person who died without leaving a will. inventory an inventory is a legal list of all the property in a deceased person's estate. The executor of the will is required to make an inventory. issue children, descendants, offspring.