In biology, a family is a taxonomic rank, or a taxon at that rank. Each family contains one or more genera. The next important rank is that of order. Usually, the name of the family ends with a "idae" for animals, and "aceae" for plants. Sometimes there are also subfamilies and superfamilies. Subfamilies end with "inae" or "oideae".
In Latin, family is "familia".
For example, walnuts (genus Juglans) and hickories (genus Carya) both belong to the walnut family (the Juglandaceae).
noun, plural: families
(2) A taxonomic group of one or more genera, especially sharing a common attribute.
(3) A collection of things or entities grouped by their common attributes, e.g. protein family, gene family, etc.
(4) A group of people descended from a common ancestor; a kin; a tribe.